Burettes are used to deliver a known amount of liquid.

滴定管是用来转移一种已知体积的液体的。

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But, it is inherent in the physics of the transistor, when it is used in this manner, that the output will vary by a known amount for a given change in temperature.

不过，当这么使用晶体管时，因为其固有物理属性，对于某一给定的温度改变其输出也会产生一个已知数量的变化。

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In the case of quantitative analysis of impurities accuracy should be assessed on samples (of drug substance or drug product) spiked with known amount of impurities.

对于杂质的定量分析，应使用以已知数量杂质增敏的样榀来评估准确度。

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The $2.4 billion figure approved by the Global Fund to Fight AIDS, Malaria and Tuberculosis is $350 million less than last year's amount, which was set before the full effects of the world economic slump were known.

VOA: standard.2009.11.15

Three years, the best known, is the amount of time the IRS has to adjust your return.

FORBES: When It Comes to the Two Year Statute - You are on Your Own

Some States members have called for the amount, known only to the members of the Home Department and the Policy Council, to be released to the public.

BBC: Guernsey States confidential deal to be reviewed

Traders typically put down just a small percentage of a gold contract's full value in order to trade it, and this amount, known as margin, must be increased when prices fall.

WSJ: Gold On Track for Biggest One-Day Fall Since 1983