常見例句The fragments may well have been primordial planetesimals, according to Weaver.維沃認為,這些碎片是最原始的星子。The planetesimals accretions of the Earth obviously have two stages, including initial accretion and late accretion.這種不均一性起源于前地球階段堆積星子的不均一性。 返回 planetesimals