These words have similar spellings but completely different meanings. If you compliment someone, you say something very nice to them.这两个词拼写相似，但意义完全不同。compliment 指赞美、称赞：◆She complimented me on my English.她夸奖我的英语好。 If one thing complements another, the two things work or look better because they are together. * complement 表示相辅相成、相配合：◆The different flavours complement each other perfectly.不同的味道搭配在一起，可口极了。
The adjectives are also often confused.这两个词的形容词形式亦常混淆。：Complimentary：◆She made some very complimentary remarks about my English.她对我的英语赞赏有加。 It can also mean 'free'.该词亦含免费赠送之义：◆There was a complimentary basket of fruit in our room.我们房间里有一篮免费赠送的水果。Complementary：◆The team members have different but complementary skills.队员技术不同但能互补。