(noun.) marine or freshwater mollusks having a soft body with platelike gills enclosed within two shells hinged together.
(adj.) used of mollusks having two shells (as clams etc.) .
整理:怀亚特
双语例句
The ocean pearl oyster or bivalve (_avicula margaritifera_) and fresh water mussel (_unio margaritifera_) have wonderful homes--their shells. 佚名.神奇的知识之书.