I think dictionary is the most useful book, because it can teach us a lot.
我觉得字典是最有用的书本，因为它能教给我们很多知识。
A car and a dictionary are both useful.
汽车和字典都有用处。
This is a most useful dictionary.
这是一本非常有用的字典。
After you have learned to use a dictionary, it can become your most useful book.
当你知道如何使用它之后，它将成为你最有用的书本。
After you have learned to use a dictionary, it can become your most useful book.
当你知道如何使用它之后，它将成为你最有用的书本。
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