1. The nucleated cell of a spermatozoon. 
   精子的有核的细胞
2. Composed of or resembling fibrous tissue. 
   由纤维组成的，纤维状的由纤维组成的或类似纤维组织的
3. A fibrous, membranous, or fatty sheath that encloses an organ or part, such as the sac surrounding the kidney or the fibrous tissues that surround a joint. 
   被膜，囊似纤维的，呈膜状或含很多脂肪的套，内包有一个器官或部位，如包裹着肾的囊或包裹着一个关节的纤维状组织
4. the act of becoming pregnant; fertilization of an ovum by a spermatozoon. 
   怀孕的行为；卵子与精子结合成受精卵的过程。
5. The process of forming a myelin sheath. 
   髓鞘形成形成髓鞘的过程

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