15. 19% of Americans exceed either the daily or weekly levels; one in 12 of those people has already progressed to alcohol abuse or alcoholism.
19%的美国人超出了每日或每周的水平，这些人当中有1/12已经发展到了酒精滥用或上瘾的程度。
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16. To get a sense of how women have progressed in science, take a quick tour of the physics department at the University of California, Berkeley.
要了解女性在科学领域的进步，可以快速参观一下加州大学伯克利分校的物理系。
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17. It was only when the hull was hanging freely from the lifting frame, clear of the seabed and the suction effect of the surrounding mud, that the salvage operation progressed to the second stage.
只有当船体从升降架上自由悬挂，脱离海床和周围泥浆的吸力作用时，打捞工作才进入第二阶段。
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18. As the Little Ice Age progressed, farmers probably moved their fields to lower elevations, infringing on the lands of other farmers and pushing people together, thus contributing to the aggregations.
