mollusc(US also mollusk), / ˈmɔləsk; `mɑləsk/ n any of the class of animals, including oysters, mussels, snails and slugs, that have a soft body, no backbone, and usu a hard shell 软体动物（包括牡蛎、 贻贝、 蜗牛、 蛞蝓等）.
牛津英汉双解词典