cleavage:
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1. Informal The hollow between a woman's breasts, especially as revealed by a low neckline.
【非正式用語(yǔ)】 乳溝，胸槽：婦女兩乳間的凹陷，尤指低領(lǐng)口展露的部分
the visible gap between a woman's breasts. Zero gap preferred, 1/2" is interesting, 3" is boring, 5" is too much.
also
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1. 劈開(kāi);開(kāi)裂[u]
2. 裂開(kāi)的方式[u]
3. 裂縫;分裂[C]
a sharp cleavage in society between rich and poor
貧富之間明顯的分裂