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- Primary endosperm nucleus and the degenerating antipodal cells;8. 7.;初生胚乳核和开始退化的反足细胞；
- The other male gamete fuses with the secondary nucleus, forming the primary endosperm nucleus. 另一个雄配子和次生核结合形成初生胚乳核。
- The development of the endosperm is of nuclear type.The division of primary endosperm nucleus is prior to that of zygote. 胚乳的发育属于核型，初生胚孔核的分裂远远早于受精卵的分裂。
- The primary endosperm nucleus division was often prior to zygote, and it divided quickly.The endosperm cells surrounding the embryo were disintegrated during the development of embryo. 初生胚乳核先于合子分裂，胚乳细胞分裂较快，胚周围的胚乳细胞有降解现象。
- The development of endosperm was of Nuclear type.The primary endosperm nucleus division was often posterior to zygote, and its division speed was also slower than that of embryo cells. 胚乳发育属核型，初生胚乳核常常晚于合子分裂，胚乳核的分裂速度慢于胚体细胞的分裂速度。
- One fuses with the egg cell to form a zygote while the other either degenerates or, in certain angiosperms, fuses with the polar nuclei to give the primary endosperm nucleus. 一个与卵细胞结合形成受精卵，另一个要么退化，要么在某些被子植物中与极核结合形成初生胚乳核。
- several divisions of primary endosperm nucleus 初生胚乳核的几次分裂
- The endosperm is usually triploid and develops from the primary endosperm nucleus, the triploid nucleus resulting from the fusion of one of the male gametes from the pollen tube with the polar nuclei in the embryo sac. 胚乳通常是三倍体，由初生胚乳核发育而来，三倍体核来源于花粉管中的雄配子与胚囊中两个极核的融合。
- Zygote, in which the male and female nucleoli not fused yet, and primary endosperm nucleus already divided; 8.;受精卵，精、卵核核仁尚未融合，初生胚乳核已分裂形成胚乳核；
- primary endosperm nucleus 初生胚乳核
- The pollen grain germinates on a special extension of the carpel, the stigma, and double fertilization results in a diploid zygote and triploid (usually) endosperm nucleus. 花粉粒在柱头上萌发，双受精导致双倍体的合子和三倍体的胚乳形成。
- The majority embryo of seeds aborted at earlier stage could develop to earlier globular embryo phase due to the abnormal endosperm nucleus division. 与正常杂种相比，早期败育型杂种的初生胚乳核分裂出现异常，多数胚最终只能发育至球形早期；
- Double fertilization The fusion of one pollen nucleus with the egg to form the zygote and of the other pollen nucleus with a polar nucleus to form the triploid endosperm nucleus. 双受精：指花粉粒中的一个精子与胚珠中的卵细胞结合形成受精卵，另一个精核与极核结合形成三倍体的胚乳核。
- The endosperm development follows the Nuclear type and includes three successive stages, which are free endosperm nucleus stage, cellularization stage and mature stage. 胚乳发育类型为核型，包括游离核阶段、细胞化阶段和生长成熟阶段。
- The disease is still in its primary stage. 这疾病仍然在初发阶段。
- The little boy left primary school at eleven. 这个小男孩十一岁时小学毕业。
- Sure. We are friends since primary school. 当然，我们从小学就是朋友了。
- I started primary school when I was 5 years old. 我五岁时开始读小学。
- A primary cause of Tom's failure is his laziness. 懒惰是汤姆失败的主要原因之一。
- Primary school teachers use a lot of visual aids. 小学教师使用大量的视觉教具。
