a whale at的用法和樣例：
例句
用作名詞 (n.)
- Mr. Frick is a good judge of character.
弗里克先生是個善於判斷人品的人。 - He was not a man to make an abrupt transition.
她不是一個善於突然改弦易轍的人。 - The boy was a zealous collector of stamps.
這個孩子熱心於搜集郵票。 - In this way we shall be keen on practising economy,instead of trying to start too many undertakings at once.
這樣也就會熱心於節約，而不熱心於百廢俱興。
