shell sac造句

例句与造句

1. Pilsbry ( 1948 ) stated that " the enormously developed mantle, the large empty shell sac, and the insertions of the free retractor muscles along the margins of the foot cavity, instead of dorsally as in the Arionidae are special to the Philomycidae ".
2. It's difficult to find shell sac in a sentence. 用shell sac造句挺难的