天外来客对地球的撞击与白垩纪的物种灭绝事件有着最为密切的联系。
An extraterrestrial impact is most closely linked to the Cretaceous extinction event.
然而，关键点在于，陨石在撞击与喷发过程中的受热程度，还不致摧毁其内部的生物体。
It is crucial, however, that the impact and ejection do not heat the meteorites enough to destroy the biological materials within them.
利用高低压发射装置，测定了含能颗粒床在不同环境温度下动态撞击与动态挤压的破碎程度；
The grain fracture of energetic particle bed as a result of dynamic impact and dynamic compression at different temperature was measured by using a high-low pressure launch set.
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