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单词
polar nucleus
释义
WordReference Random House Unabridged Dictionary of American English © 2024
po
′
lar nu
′
cleus,
[
Bot.
]
either of two female haploid nuclei, in the embryo sac of flowers, that fuse to produce a diploid nucleus, which combines with a male nucleus to form the endosperm.
1880–85
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更新时间:2025/7/3 13:42:46