When I do positive work, gravity does negative work.
当我做正功的时候，重力做的是负功。
When I do negative work, like I do now, gravity does positive work.
当我像这样做负功时，重力做正功。
If I do positive work, gravity is doing negative work.
重力做负功，如果我做负功。
So whenever gravity is doing positive work, I would be doing negative work.
因此不管何时重力,做正功，我就做负功。
If I do positive work, the gravity is doing negative work.
如果我做正功，重力做负功。
If I do positive work, the gravity is doing negative work.
如果我做正功，重力做负功。
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