放入水中的温度计能告诉我们水的温度，但它无法表明水所含有的热量。

A thermometer put in the water can tell us the temperature of the water, but in no way does it show the amount of heat the water contains.

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但是他们补充说，研究无法表明钙和奶制品食物的摄取量和除了消化系统的其他如前列腺癌，乳腺癌或其他任何癌症有什么关联。

However, no association between calcium and dairy food intakes were observed for prostate, breast or any cancer in another anatomical system besides the digestive system, they added.

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过去，商家通过监测客流量来获取进入店面的顾客人数。 但顾客人数无法表明人们都到哪些区域以及在这些区域停留的时间长短。

Traditionally retailers measure “footfall”, as the number of people entering a store is known, but those numbers say nothing about where people go and how long they spend there.

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It's true, these questions have been debated for a very long time but the very fact that they have recurred and persisted may suggest that though they're impossible in one sense, they're unavoidable in another.

诚然，这些问题争论已久,但正因为这些问题反复出现,也许表明，虽然在某种意义上它们无法解决，但另一种意义上，却又无可避免。

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