Every currently operating light-water reactor, if deprived of power and cooling water, can melt down.

世界上所有的轻水反应堆，一旦电力和冷却水供应不足，都有可能发生反应堆事故。

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Dr Hart explained that, because sharks live underwater and many are most active at dawn and dusk, they are operating in relatively dim light.

豪特教授解释“因为鲨鱼在水下生存并且很多都喜欢在黄昏和拂晓活动，所以他们生活在相对比较昏暗的环境中。 就如人们在夜晚利用道路反射的光线照明一样，但有一些鲨鱼在一天所有的时间内活动且他们视网膜比一些夜间出没的肉食动物和深水动物拥有更多的视锥细胞和少量的棒形细胞”。

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So the third chapter focuses on the measuring system. The operating principle (Light extinction method), the factors which influence the result and the resolvent to avoid them are explained.

第三章对此磁致偏振特性测量系统的搭建及工作原理（消光法）、影响测量结果的因素及解决方法、实验操作步骤等作了说明。

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Three video pictures of the operation streamed on the screen one from a camera in the operating light, one from a wide-angle room camera, and one with the feed from the anesthesia monitor.

NEWYORKER: Personal Best

Yet all the teams are committed to dramatically reducing their operating costs, particularly in the light of Honda's pull-out.

BBC: Cost-cutting plan agreed for F1

But this digital Battle of Verdun is not the only challenge for Google as Mozilla is also launching its mobile operating system: FirefoxOS. To make a long story short, FirefoxOS is the equivalent of ChromeOS for smartphones: a light-weight mobile operating system where the user interface and all applications are web-based.

FORBES: How Alibaba And Mozilla Are Trying To Break Google And Apple Duopoly On Smartphone