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。

youdao

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”。

youdao

Spitzer's liquid helium coolant ran out in May 2009, so this false color view is from two channels that still remain sensitive to infrared light at warmer operating temperatures.

斯皮策的液态氦冷却剂在2009年5月用完了，所以这张假彩色图像来自在目前较温暖的操作温度下对红外光仍然敏感的两个波道。

youdao

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

Well, much like its bigger X-rated sibling, we won't really know until that shiny new operating system gets to see the light of day.

ENGADGET: Windows Phone 8S by HTC hands-on: a bright Windows phone that holds promise (video)