例句與造句

1. In particular, every covering of a manifold is a manifold, and the covering homomorphism becomes a smooth map.
2. Likewise, given any discrete normal subgroup of a Lie group the quotient group is a Lie group and the quotient map is a covering homomorphism.
3. It's difficult to find covering homomorphism in a sentence. 用covering homomorphism造句挺難的