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1. The gametophyte sheath is a protective layer that protects the developing embryo from external factors.
胚囊鞘是一种保护层，保护发育中的胚胎免受外部因素的影响。
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2. During fertilization, the egg and sperm fuse to form a zygote, which then develops into acomplete organism.
在受精过程中，卵子和精子融合形成一个合子，然后发展成一个完整的生物体。
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3.In some species, the gametophyte sheath can be shed before the zygote has developed, allowing for further growth and development of the embryo.
在某些物种中，胚囊鞘可以在合子发育之前脱落，允许胚胎进一步生长和发展。