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Microspore abortion occurred after the tetrad formation.是什么意思？

Microspore abortion occurred after the tetrad formation.

小孢子败育发生在四分体形成以后.

相关词汇
microspore abortion occurred after the tetrad formation

microspore

n. 小孢子，（种子植物的）花粉粒；

abortion

n. 流产，流产的胎儿，畸形，夭折；

occurred

v. 发生(occur 的过去分词)；

after

prep. …后的，（表示时间）在…以后，（表示位置、顺序）在…后面；conj. 在…以后；adv. 以后，继后；adj. 后来的，以后的；

the

art. 指已提到的人（物），指说话人与听者已知的人（物），用于独一无二的事物前，与形容词最高级和序数词连用；

tetrad

n. 四元组，四分染色体，<化>四价元素，（数目）4；

formation

n. 形成，构成，结构，形成物，编队，队形；
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