a sharp division; a split 劈开;分裂 a system dominated by the class cleavage. 由阶级分裂主导的制度。 ■the hollow between a woman's breasts when supported, especially as exposed by a low-cut garment (尤指妇女穿低胸衣物露出的)乳沟 ■[mass noun](Biology)cell division, especially of a fertilized egg cell (生)细胞分裂(尤指受精卵细胞分裂),卵裂 ■[mass noun]the splitting of rocks or crystals in a preferred plane or direction (岩石、晶体的)解理,劈理