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1·'Old' has two possible antonyms: 'young' and 'new'.

old的反义词可能有两个：young和new。《牛津词典》

2·Small and big are antonyms.

快乐是悲哀的反义词。

3·Small and big are antonyms.

小和大是反义词。

4·A thesaurus is a book of synonyms and antonyms.

同类语词典是一本拥有同义词和反义词的书。

5·How can you find antonyms in the thesaurus?

你怎么能在同义词典中发现反义词呢？

6·Also make sure to learn synonyms or antonyms.

当然对于它的近义词与反义词我们也要掌握。

7·In my opinion, this is also a pair of antonyms.

依我看，这又是一对反义词。

8·What about like and hate, are they antonyms?

那么“喜欢”和“讨厌”呢，它们是反义词吗？

9·Can you give the antonyms of the following adjectives?

你能给出下列形容词的反义词吗？

10·It isn't only the synonyms; there are also the antonyms.

同义词可以，反义词也可以。