Noun:

1. the state of being split or cleft;

   "there was a cleavage between the liberal and conservative members"
   

2. the breaking of a chemical bond in a molecule resulting in smaller molecules

3. (embryology) the repeated division of a fertilised ovum

4. the line formed by a groove between two parts (especially the separation between a woman's breasts)

5. the act of cleaving or splitting

splitv.分裂；将…分成若干部分；分摊；分离；劈开；裂开；<俚>离开n.劈开；裂口；分裂；一份；水果冰淇淋adj.分裂的；意见分歧的

breakv.打碎；折断；违背；解决；中断；透露；变弱；锐减；结束n.破裂；休息；中断；急冲；好运

divisionn.划分；除法；部门；分开；师（军队）

cuttingn.切断；切下；开凿；插条；剪报adj.挖苦的；刺骨的动词cut的现在分词.

separationn.分离；分居；缺口；分隔线；[化]离析；【航】间隔

segmentationn.分割；[生]细胞分裂；[计]程序分段

1. This cleavage persisted during the whole civilized period.
   这种分裂继续存在于整个文明期。
2. There was indeed a cleavage between them.
   他们之间确有分岐。
3. He had made a great cleavage in his life.
   他已在自己的生活里劈出了一条鸿沟。
4. That new gown shows a large amount of her cleavage!
   那件新的女长服袒露出她大部分乳沟！
5. The lay of the strata can imply that the rock splits easily along its direction of cleavage.
   成层的地层意味着岩石易于沿着其解理方向裂开。
6. This marks the end of the cleavage stage of development.
   这标志着卵裂发育阶段的结束。
7. Cleavage produces a blastula, a sheet of cells rounded into a sphere that in most species surrounds a cavity.
   卵裂产生一个囊胚，形成的细胞壁球形排列形成一个空腔。