Scientists have long known that vitamin D is a vital nutrient that the skin produces when hit by sunlight. The amount varies, depending on where the person lives, skin pigment, age and other factors.

科学界的共识是,人的皮肤可以通过日晒产生维生素D.而产生的数量并不固定,这取决于人所在地,皮肤的状况,年龄以及其他的因素.

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The cost of the alcohol duty varies according to the amount of wine in the bottle.

这项酒税的额度根据瓶中酒量的不同而变化。

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The relative amount of these two kinds of water varies greatly from one kind of rock or sediment to another, even though their porosities may be the same.

这两种水的相对含量在不同的岩石或沉积物之间差异很大，尽管它们的孔隙率可能是相同的。

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And three: the amount of caffeine varies greatly.

VOA: special.2009.07.22

And most people are heterosexual There's a considerable amount that varies cross-culturally of people who are bisexual But the real puzzle is exclusive homosexuality ? So, why?

多数人都是异性恋的,而且不同文化背景下…,还有很多双性恋者,但真正的难题在于绝对同性恋,为什么呢？

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Five of the other councils will still make a contribution to the care of elderly who possess such a sum, but the amount varies.

BBC: Inside Out: London's elderly care 'lottery' revealed

The Scottish government is cutting the amount it gives councils by an average of 2.6% but the exact amount varies as central government money is distributed to councils through a complicated formula which takes account of several different factors about the area's population.

BBC: D-day for Scottish council budgets

The amount of the fine varies from place to place.

ECONOMIST: The one-child policy