it's a dictionary改为复数句是
They are dictionaries.
注 名词，动词 代词的改变
It's a dictionary，
那是一本词典。
复数就是
They are dictionaries。他们是词典。
it的复数they它们
is 的复数are
dictionary复数dictionaries
所以就是they are dictionaries
They are dictionaries.
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