The reasons causing environmental geological problems are over exploitation, water level drop and river water recharge.

过量开采、水位下降、河水回灌是导致诸环境地质问题的根本原因；

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The results show that the viscoelasticity of PCB and its size have distinct influence on dynamic properties of PCB under board-level drop impact.

结果表明，电路板的黏性系数和尺寸对板的动力学特性有显著影响。

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If Canada level pricing came to the United States, the industry's profit margins would drop and the pace of new drug development would slow.

如果加拿大的定价水平也适用于美国，制药行业的利润率将会下降，新药开发的步伐将会放缓。

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So that explains why they're so reactive, they're all very willing to give up that one s orbital and then drop to a lower energy level.

这就解释了它们的化学性质为什么非常活泼，它们都很愿意失去那个，s，电子,然后降到更低的能级上去。

麻省理工公开课 - 化学原理课程节选

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

They suspect that ultimately their compensation level would drop if put under the U.S. Trust system.

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Defense Secretary Robert Gates says he hopes that level can drop to 100, 000 by the end of next year.

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The only other difference, FEMA said, was that if the state handled it, at some point the federal reimbursement level could drop from 100 percent to 90 percent.

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