vector d造句

例句与造句

1. Define the vector d to be the reflection direction r projected onto the plane P:
2. (Any such point P would suffice to reverse the process as the vector d defines the direction taken by L in the usual 3D space, therefore it will then be easy to compute any classical / cartesian property about L .)
3. It's difficult to find vector d in a sentence. 用vector d造句挺难的