This exposure is made with a small F-stop to a sheet of white paper placed over the original, or to the rays from a flash - lamp.

闪光曝光，可用小光圈档，用一张白纸放在原稿上面或用闪光灯曝光。

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The paper also notes that while the skin absorbs Vitamin D naturally from the sun, it takes more exposure for African Americans to reach the same level of Vitamin D as white individuals.

该论文也提醒人们，在让皮肤通过自然方法从太阳吸收维生素D的同时，美国黑人需要在阳光下暴露更多时间才能达到和白人相同的维生素D含量。

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That said, today's banking White Paper from the Treasury, which translates Vickers into firm policy, contains all sorts of other measures to limit the exposure of taxpayers to our banks - such as ring-fencing retail operations, so-called resolution procedures for breaking up banks in a crisis, and forcing banks to hold more debt able to absorb the losses that are generated when things go horribly wrong.

BBC: Osborne and the safe size for British banks