1. Bivalves, such as clams and mussels, have a hinged two-part shell.
诸如蛤蜊和贻贝之类的双壳动物具有一个有铰链的两部分壳。

2. The bivalve filter-feeds by pumping water through its gills to extract food particles.
双壳动物通过将水泵送到鳃中来提取食物颗粒进行滤食。