它可以由自发分裂的铀原子自然生成。
It can be naturally generated from Uranium atoms that have spontaneously split.
本文对桑蚕的自然单性生殖、人工单性生殖、减数分裂和非减数分裂的单性生殖发育等研究进展进行了简要地阐述；
In this paper, the progresses of research on the natural and artificial parthenogenesis, ameiotic and meiotic parthenogenesis of the silkworm(Bombyx mori) were described in brief.
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