If I hold it in my hand, when I'm doing positive work, gravity is doing negative work.

如果把它举在手中，当我做正功时，重力就做负功。

youdao

If I hold it in my hand, when I'm doing positive work, gravity is doing negative work.

如果把它举在手中，当我做正功时，重力就做负功。

youdao