这些撞击会持续对地球上的生命构成自然威胁。
Such impacts continue to pose a natural hazard to life on Earth.
深度撞击将持续观察哈特利2号直到感恩节，然后等待来自美国宇航局的进一步指示。
Deep Impact will observe Hartley 2 until Thanksgiving and then wait for further instructions from NASA.
专家们相信这次撞击会在木星的云层中制造出一块可以在接下来几天里持续观测到的深暗色碎片区，就像之前的撞击所留下的痕迹一样。
Experts believe the collision should produce a dark debris field in Jupiter's clouds-similar to the previous impact site-which may become visible over the next few days.
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