The disconnection from power network of power plants under emergency conditions may cause serious frequency drop and then large area outage, even power network collapse.

在突然恶性事故情况下，由于发电厂的退出，电力系统有可能产生严重的频率下降，导致系统崩溃和大面积停电事故。

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Underfrequency load shedding (UFLS) is a widely accepted effective measure to repress further frequency drop. Most of UFLS schemes use pre specified steps based on measured frequency to shed load.

低频减载(UFLS)无疑是一种抑制频率下降的有效方法，它依据测量到的频率值，按轮次分步骤地减掉负荷。

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Of course, the frequency of new words used drops off in longer novels, but the patterns of the drop-off differed and were specific to each of the three authors.

当然，在长篇小说中，这种使用新词的频率会下降，但即使是频率的下降模式也各不相同，为三位作家所特有。

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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

It installed 33 RangeLAN 2 series radio frequency transceivers, or access devices, in the drop ceilings above classrooms, the cafeteria and the library.

CNN: Florida law school uses wireless technology

Spencer Birns, Cardiff Airport's head of commercial operations and air services development, said the bulk of the passenger drop was due to bmibaby's cuts to routes and frequency of service.

BBC: Cardiff Airport