Dieticians know from their experience that it is very difficult to reduce the usual quantity of food, which is the reason of most failures.

膳食专家从他们的经验知道，要减少日常的进食量是十分困难的。这正是大多数人减肥失败的原因。

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It's also why, to extract a given quantity of metal, less material needs to be processed, which is the most environmentally destructive part of mining.

同样，提取同样数量的金属所需处理的物质相对较少。

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To look at the total quantity of water on Earth, some 96.5 per cent of it lies in the oceans (and is, most unhelpfully, salty).

在地球上有96.5%的水是在海洋里，而且是不能食用的咸水。

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According to the Human Performance Institute in Florida, improving the quantity and quality of rest is one of the most effective ways to work more efficiently.

FORBES: How Doing Nothing Makes You Money.

One of fund managers' most frequent complaints is over the huge quantity and poor quality of research from financial behemoths that are keener to please their investment-banking clients than to provide critical research.

ECONOMIST: Soft commissions in Britain

Although Assad is a sworn enemy of Israel, he is also a known quantity, and his family has been careful to keep the border with Israel quiet for most of the past 40 years.

NPR: Israel Warns Syria Against Attacks On Golan