例句與造句

1. An ideal in a graded ring is homogeneous if and only if it is a graded submodule.
2. A "'graded submodule "'is a submodule that is a graded module in own right and such that the set-theoretic inclusion is a morphism of graded modules.
3. It's difficult to find graded submodule in a sentence. 用graded submodule造句挺難的