例句與造句

1. The trivial space and the whole vector space are invariant, always, and even in the finite dimensional case there need not be any others.
2. What Bott periodicity offered was an insight into some highly non-trivial spaces, with central status in topology because of the connection of their cohomology with characteristic classes, for which all the ( " unstable " ) homotopy groups could be calculated.
3. It's difficult to find trivial space in a sentence. 用trivial space造句挺難的