Reactor operators calculate how long it would take, once cooling is lost, for the spent fuel to boil the water it sits in.
反应堆操作员计算过燃料池使输入的冷却水沸腾（即冷却失效）需多少时间。
For instance, they don't know how long the fat converting effects remain in the body once the virus has left it.
例如，他们不知道一旦病毒离开人体，脂肪转化效果能持续多久。
It takes a long time to learn how to NOT judge yourself through someone else's eyes, but once you do the world is yours for the taking.
我们需要很长时间才能学会，如何不通过他人的眼光来评价自己。然而你一旦学会，整个世界都在你手中。
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