Nearly all traces of the asteroids and comets that struck Earth billions of years ago have been erased from our planet's geologically active surface.
在地球上，所有数十亿年前被小行星和彗星撞击的痕迹，几乎都已经被地球表面的地质活动所抹去。
Nearly all traces of the asteroids and comets that struck Earth billions of years ago have been erased from our planet's geologically active surface.
在地球上，所有数十亿年前被小行星和彗星撞击的痕迹，几乎都已经被地球表面的地质活动所抹去。
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