as far as they were concerned 一旦他们是忧伤的 the earth was safe 地球是安全的 what you visualise is what we learn 你想象到的恰是你学到的 ..
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更糟糕的是，科马罗夫安全返回地球的机会正在快速流失。
And worse, Komarov's chances for a safe return to Earth were dwindling fast.
一个新的计算模型说明了在太阳系统是怎样阻止年轻的地球和其他早期行星螺旋形地下沉到太阳里去，从而使它们能够安全地保存下来。
A new model keeps the solar system safe for the young Earth and other infant planets by preventing them from spiraling into the sun.
我们必须确保任何地球工程学的研究是在一个透明，责任和环境安全的方式。
We must ensure that any geoengineering research is conducted in a transparent, responsible and environmentally safe manner.
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