复合形式：
letter | lettered |
| acceptance letter n | (for taking a job offer) (工作) | SCSimplified Chinese 接受函 |
| | | SCSimplified Chinese 接受信 |
| | In her acceptance letter, Mary asked for confirmation of her starting salary. |
acceptance letter,
letter of acceptance n | US (for admission to university) | SCSimplified Chinese 录取通知书 |
| | Stacey was thrilled to receive an acceptance letter from Harvard. |
| according to the letter expr | (according to law) | SCSimplified Chinese 严格地根据法律 yán gé de gēn jù fǎ lǜ |
| | | SCSimplified Chinese 严格依法 yán gé de gēn jù fǎ lǜ，yán gé yī fǎ |
| | These laws are no longer obeyed according to the letter. |
| according to the letter expr | (word for word) | SCSimplified Chinese 根据字面意思 gēn jù zì miàn yì si |
| | Calvin interprets the biblical text according to the letter. |
| | 卡尔文根据字面意思解读圣经经文。 |
aerogram,
aerogramme,
air letter,
airletter n | (thin stationary for use in airmail) | SCSimplified Chinese 航空信件 háng kōng xìn jiàn |
| approval letter n | (document giving permission for [sth]) | SCSimplified Chinese 批准信 |
| | | SCSimplified Chinese 批准书 |
| black letter | (printing) | SCSimplified Chinese 黑体字 |
| | | SCSimplified Chinese 黑体 hēi tǐ |
| block letter n | (style of lettering) | SCSimplified Chinese 方体字 |
| block letter n | (hand-written capital letter) | SCSimplified Chinese 大写印刷字体 |
| business letter n | (business correspondence) | SCSimplified Chinese 商务信函 shāng wù xìn hán
TCTraditional Chinese 商務信函 |
| | A letter to a friend is different from a more formal business letter. |
| caps npl | abbreviation (capital letters) (capital letters 的缩写) | SCSimplified Chinese 大写字母 dà xiě zì mǔ
TCTraditional Chinese 大寫字母 |
| | The title of the book should be in caps. |
| capital letter n | often plural (alphabet: upper-case) | SCSimplified Chinese 大写字母 dà xiě zì mǔ
TCTraditional Chinese 大寫字母 |
| | Sentences must start with a capital letter and end with a full stop. |
case,
letter case n | (type: capitals or small letters) (字母) | SCSimplified Chinese 大小写 |
| | In an email address, it makes no difference whether the case is upper or lower. |
| chain letter | (ongoing letter) | SCSimplified Chinese 连环信 |
| | | SCSimplified Chinese 连锁信件 |
| comfort letter | (financial insurance) | SCSimplified Chinese 安慰信 |
| | | SCSimplified Chinese 告慰信 |
cover letter (US),
covering letter (UK) n | (job application) | SCSimplified Chinese 求职信
TCTraditional Chinese 求職信 |
| | To apply for the position, please send your resume and a cover letter. |
| | 如申请本职位，请发送您的简历和求职信。 |
cover letter (US),
covering letter (UK) n | (letter providing additional information) | SCSimplified Chinese 附信 |
| | | SCSimplified Chinese 附函 fù hán |
| | Julie posted the documentation with a covering letter. |
| | 朱莉将文件同附函一道寄了出去。 |
| dead letter n | (law not yet formally repealed) (指已经失效但尚未正式废除的) | SCSimplified Chinese 空文法律 |
| dead letter n | (letter stuck in transit) (指无法投递也无法退回的信件) | SCSimplified Chinese 死信 |
Dear John letter,
Dear John n | informal (letter ending relationship) | SCSimplified Chinese 分手信 |
| | | SCSimplified Chinese 绝交信 |
| 备注: Sometimes the use is extended to non-romantic relationships. |
| form letter n | (standardized correspondence) | SCSimplified Chinese 正式信函，公文，公函 zhèng shì xìn hán，gōng wén，gōng hán
TCTraditional Chinese 公文 |
| | | SCSimplified Chinese （投递给多人的）印刷函件 tóu dì gěi duō rén de yìn shuā hán jiàn |
| | Word-processing software is useful for producing form letters. |
| four-letter adj | (word: having four letters) | SCSimplified Chinese 四个字母的，四字母的 |
| four-letter word n | (curse word, bad word) | SCSimplified Chinese 粗话，脏话 cū huà，zāng huà |
letter bomb,
also US: mail bomb n | (explosive device inside envelope) | SCSimplified Chinese 信件炸弹
TCTraditional Chinese 郵件炸彈 |
| | | SCSimplified Chinese 邮件炸弹 |
| 备注: 恐怖分子利用邮件寄出的炸弹 |
| letter carrier | (mail carrier) | SCSimplified Chinese 邮递员 yóu dì yuán
TCTraditional Chinese 郵差 |
| letter drop | (slot in door) | SCSimplified Chinese 投信口 |
| letter of complaint n | (written criticism) | SCSimplified Chinese 投诉书 |
| | | SCSimplified Chinese 投诉信 |
| letter of credit n | (bill of exchange) | SCSimplified Chinese 信用状
TCTraditional Chinese 信用狀 |
| | | SCSimplified Chinese 信用证 |
| the letter of the law n | (strict interpretation) | SCSimplified Chinese 法律的字面意思 |
| | They followed the letter of the law to avoid any problems. |
| letter opener n | (bladed tool for opening envelopes) | SCSimplified Chinese 开信刀
TCTraditional Chinese 開信刀 |
letterbox,
letter box n | (slot, box for delivered mail) | SCSimplified Chinese 收信箱 shōu xìn xiāng |
| | Someone just put a pile of junk mail through my letterbox. |
letterbox,
letter box n | UK, informal (box for posting mail) | SCSimplified Chinese 邮筒 yóu tǒng |
| | | SCSimplified Chinese 邮政信箱 yóu tǒng，yóu zhèng xìn xiāng
TCTraditional Chinese 郵政信箱 |
| | The letter box in the village is emptied at 6.30 pm. |
| love letter n | (letter expressing romantic feelings) | SCSimplified Chinese 情书 qíng shū |
| | He wrote her a love letter every day while he was away. |
| love letter to [sth] n | figurative (expression of affection) | SCSimplified Chinese 情话，表白 qíng huà，biǎo bái |
| | The movie is his love letter to the city of Rome. |
mail carrier,
letter carrier n | US (person employed to deliver post) | SCSimplified Chinese 邮递员 yóu dì yuán
TCTraditional Chinese 郵差 |
| | My dog barks at my mail carrier every day. |
| open letter n | (letter published openly) | SCSimplified Chinese 公开信 gōng kāi xìn
TCTraditional Chinese 公開信 |
| | She wrote an open letter to the newspaper praising the mayor of the town. |
| personal letter n | (intimate correspondence) | SCSimplified Chinese 私人信件 sī rén xìn jiàn |
| | The starlet enjoyed receiving personal letters from her many fans. |
| | In the age of texting and e-mail, the personal letter is in danger of becoming obsolete. |
poison pen letter,
poison-pen letter n | figurative (spiteful or defamatory letter) | SCSimplified Chinese 匿名诽谤信 |
| | Someone in the village is writing poison-pen letters to his family. |
red letter,
red-letter n as adj | figurative (special, noteworthy) | SCSimplified Chinese 特殊的 tè shū de |
| | | SCSimplified Chinese 重要的 tè shū de ，zhòng yào de |
| | | SCSimplified Chinese 值得纪念的 tè shū de ，zhí dé jì niàn de |
red-letter day,
red letter day n | (noteworthy or memorable day) | SCSimplified Chinese 大喜日 |
| | | SCSimplified Chinese 纪念日 jì niàn rì |
| reference letter n | (statement in support of a job candidate) | SCSimplified Chinese 推荐信 tuī jiàn xìn
TCTraditional Chinese 推薦信 |
| | When my former assistant applied for a better job, she asked me for a reference letter. |
| registered letter n | (mail: verified) | SCSimplified Chinese 挂号信 |
| scarlet letter n | historical, obsolete (red 'A' worn to indicate adulterer) (红色A字，代表女性不忠) | SCSimplified Chinese 红字 |
| small letter n | (lowercase letter of the alphabet) | SCSimplified Chinese 小写字母 xiǎo xiě zì mǔ
TCTraditional Chinese 小寫字母 |
thank-you note,
thank-you letter n | (letter expressing gratitude) | SCSimplified Chinese 感谢信 |
| | Don't forget to send them a thank-you letter. |
| to the letter expr | (literally) | SCSimplified Chinese 不折不扣 bù zhé bú kòu |
| | | SCSimplified Chinese 毫厘不爽 bù zhé bú kòu，háo lí bù shuǎng |
| | He followed Mr. Wilson's instructions to the letter. |
| to the letter expr | figurative (precisely, exactly) | SCSimplified Chinese 不折不扣 bù zhé bú kòu |
| | | SCSimplified Chinese 毫厘不爽 bù zhé bú kòu，háo lí bù shuǎng |
| | The illiterate slave followed his master's instructions to the letter. |
| write a letter v expr | (compose handwritten correspondence) | SCSimplified Chinese 写信 xiě xìn |
| | Nowadays people are more inclined to email rather than write a letter. |