Gravity accounts for negative energy, whereas the mass of a star is undeniably positive.

引力算是负能量，当然星星的质量毫无疑问是正的。

youdao

When I do positive work, gravity does negative work.

当我做正功的时候，重力做的是负功。

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

Stock-market gravity is known by many names: negative investor sentiment, lack of confidence in the system, panic, depression and a whole host of other fun terms.

FORBES