and let's say I divide by the apple.

让我把苹果质量除过来
This whole thing, what should it be equal to?

这整个式子等于多少呢
It's got to be 9.8, you understand that?

就等于 9.8 明白吗
The acceleration of the apple,

苹果的加速度
near the Earth, has to be 9.8.

近地条件下只能是 9.8
If I put the radius of the Earth here,

如果把地球半径代到这里
this better be 9.8.

就是 9.8
So you pick a number G,

所以你选的这个数字 G
which is some number, 6 times 10 to the minus 11

数值上约等于 6 乘上 10 的负 11 次方
and the units for G are some number times Newton, m^2 over kg^2.

G 的单位是 N 乘 m^2 除以 kg^2
That'll make the units come out right.

这样等式左右量纲就一致了
So that's called a G, that's the law of--

这个数就是 G