一个数词,21
做名词时,都不加-.比如,he is twenty one.他21岁.
做形容词,做定语,放在宾语后边,不加-.比如,Now,we study lesson twenty one.
做形容词,做定语,放在宾语前边,加-.比如.a twenty-one year old girl.
Twenty-one这是什么单词
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