The balance of these two forces can keep a satellite in orbit for many years!

这两种力的平使卫星在轨道上运行多年！

However, Lagrange points are places where all these forces balance out.

但是，拉格朗日点是所有这些力平的地方。

As firefighters hosed down the Cathedral, some stones gained almost a third of their weight in water-- further changing the balance of forces between the vaults and wall.

当消防员用水管冲洗大教堂时，一些石头在水中的重量增加近三分之一——进一步改变和墙壁之间的力平。

An object in motion can stay in motion, as long it is being acted on either by a balanced force, or (i guess) a set of forces that balance each other, or no forces at all.

运动中的物体, 只要它不受力或所受的力是平力或一组相互平的力, 它将保持运动状态.