That changed in the thirteenth century when Europeans learned about a very useful Chinese invention: paper.

这种情况在13世纪发生了变化，当时欧洲人了解到一项非常有用的中国发明：纸。

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We will teach you most interesting and useful Chinese!

我们只教您最有趣有用的汉语！

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If you're after something specific, it's worth making sure you know a few useful Chinese words and phrases, such as the colour you're after, or how to ask for a smaller or larger size.

如果你想具体找某的东西，最好学点有用的中文单词和词组，比如说你想要的颜色，或者如何要个更小或大点的尺码。

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Teaming up is useful the Chinese partner can bring handy contacts, for example but management styles can conflict.

ECONOMIST: Foreign insurers eye up a fast-expanding market

An index giving a greater weight to, say, China might be less useful because there are not enough Chinese bonds to buy.

ECONOMIST: Emerging markets

Whether Chinese strategists have something useful to contribute analytically by looking through the lens of Sun Tzu or whether they have deluded themselves into accepting the capacity of information power to lift the fog of war remains to be seen.

CENTERFORSECURITYPOLICY: Center for Security Policy | Chinese Information Warfare: A Phantom Menace or Emerging Threat? | Page: 13