w=c So, I have my level surface, w equals c I have a curve on that, and at some point I'm going to have a certain velocity.

画出等值面,上面有一条曲线,某点处，有某个速度。

youdao

w=c So, I have my level surface, w equals c I have a curve on that, and at some point I'm going to have a certain velocity.

画出等值面,上面有一条曲线,某点处，有某个速度。

youdao