It quickly became a standard reference book in the States.
它在美国快速变成一本标准的参考书。
There is a reference to Tom in my book.
我的书中有一次提到汤姆。
Still in a convenient pocket-sized guide, this book remains an essential reference.
不过在方便的袖珍指南，这本书仍然是必要的参考。
Even now it is still often used as a reference book in medicine.
即便现在，人们还常常将它用作医学参考书。
Even now it is still often used as a reference book in medicine.
即便现在，人们还常常将它用作医学参考书。
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