The river types are indicated with letters used by W. K oppen in his climate classification, which will render a quick knowledge of their corresponding hydrological features.

各型河流均以W·柯本气候分类的西文字母表示，读其字母便可知各型河流的水文特征。

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For Friedman, lack of knowledge justified a k% monetary policy rule (Friedman (1960)).

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In the U.S. and the U.K., individual executive salaries are public knowledge, thanks to strict disclosure laws.

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To my knowledge, Fidelity never disclosed to 401(k) plan sponsors or participants that it had decided from 2004 to 2008, in order to bolster its own bottom line, to refuse to accept the fee discounts, rebates or revenue-sharing fund managers had agreed to pay and had been paying.

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