例句與造句

1. It is defined by replacing the model for the orbifold charts by a locally compact space with a " rigid " action of a finite group, i . e . one for which points with trivial isotropy are dense . ( This condition is automatically satisfied by faithful linear actions, because the points fixed by any non-trivial group element form a proper linear subspace . ) It is also useful to consider metric space structures on an orbispace, given by invariant geodesics connecting any two points.
2. It's difficult to find invariant geodesic in a sentence. 用invariant geodesic造句挺難的