In contrast, should another ice age occur, sea level would drop drastically.

相反，如果另一个冰河时代来临，海平面会急剧下降。

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The water in it is just right at the level of the Gaiwan's mouth, with a simple drop on the desk,

里面的水正好和盖碗的嘴一样高，只有一两滴落在在桌子上。

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A drop in pH on the level identified in the study could have some very harmful effects.

这项研究证实，pH值水平的下降可能有一些非常有害的影响。

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So this is our final equation, and this is actually called the Balmer series, which was named after Balmer, and this tells us the frequency of any of the lights where we start with an electron in some higher energy level and we drop down to an n final that's equal to 2.

把2代入到这里，所以得到1除以,这就是我们最终的方程，这叫做Balmer系，以Balmer名字命名的,它告诉我们从高能级掉到n等于2的,最终能级所发出光的频率。

麻省理工公开课 - 化学原理课程节选

Nadel points to Ohalo, a site he excavated near the Sea of Galilee that had been submerged for 20, 000 years before a drop in water level made it easy to excavate.

CNN: Mysterious structure found at bottom of ancient lake

Nadel points to Ohalo II, a site he excavated near the Sea of Galilee that had been submerged for 23, 000 years before a drop in water level made it easy to excavate.

CNN: Mysterious structure found at bottom of ancient lake

Tuesday night saw a drop in the level of violence, with 617 vehicles set ablaze and around 200 arrests, though it was not clear whether this was due to the new measures or to the unrest cooling off as rioters saw that they had made their point.

ECONOMIST: A wounded nation resorts to extreme measures | The