Skeptics have argued that a single impact would raise an asteroid's overall temperature very little and that asteroids would cool too quickly between impacts to accumulate much heat.
怀疑派认为,一次撞击只会使小行星的整体温度上升很小,而且小行星在两次撞击之间会迅速冷却,从而无法积聚大量热量。
It's very noticeable, I have found, how much freer people are with their observations, their criticisms, of a single parent with children.
我发现,非常明显,人们对一个带着孩子的单亲进行观察和提出批评,这要容易多了。
In truth, no single measure is going to achieve very much, and certainly not quickly.
事实上,没有哪个单一措施可以取得非凡成就,当然也不可能太快。
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