'helpful'はこちらの項目にも見つかりました。
英語の見出し語に対する説明:
boost
- broad-shouldered
- buy time
- case in point
- constructive
- contributing
- doll
- favor
- good citizen
- good neighbor
- Good Samaritan
- guardian angel
- heads-up
- hints and tips
- informative
- instrumental
- life saver
- lifesaver
- neighborly
- of use
- Samaritan
- supportive
- tip
- trade secret
- unaccommodating
- useful
- useless