If I hadn't been here, you would have had to ask yourself these questions and answer them by thinking, looking in a reference book, or consulting a friend.

如果我不在这儿，你可以向自己提问，然后通过思考，查阅参考书或请教朋友去弄懂它们。

youdao

The style used by the authors in this reference book (for lack of a better description) greatly increases the clarity of the book itself.

这本参考书的作者们采用的行文风格（因为缺乏更好的描述）使得它更加通俗易懂。

youdao

First published in 1783, this reference book by the American man of letters Noah Webster remained a bestseller in the U.S. throughout the 19th century.

这本参考书由美国文学家诺亚·韦伯斯特于1783年首次出版，在整个19世纪一直是美国的畅销书。

youdao

De Guilleuma investigated a reference in a book published in 1609 by the Italian Girolamo Sirtori.

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These "known unknowns" he dubbed "grey swans", in a reference to Nicholas Nassim Taleb's book "The Black Swan", about the nature of unpredictability.

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But it is an excellent reference book for anyone wanting a better understanding of economic developments in the last millennium.

ECONOMIST: World trade