applaud v. 拍手喝彩，称赞，赞同
例句：Please don't applaud until everyone has performed.
请在每个人表演完毕后再鼓掌。

appraise v. 评价
例句：It would be unwise to buy the house before having it appraised.
买房子不事先估价是不明智的。

appraisal n．评价，鉴定
例句：Her appraisal of the novel is appropriate.
她对这部小说的评价非常得当。

appreciate vt. 赏识，鉴赏，感激 vi 增值，涨价
例句：We all appreciate a holiday after a year of hard working.
经过一年辛苦工作之后，大家都非常感激有一个假日。

appreciable adj．可感知的，可评估的
例句：There is no appreciable difference between the two methods.
这两种方法没有什么分别。