两个物体的相互作用力总是大小相等,方向相反,同时出现或消失且作用于同一直线上。
The poet is not separate from the world; the poet is of the world.
It’s thrilling to be extremely polite to rude strangers.
The problem with socialism is that you eventually run out of other people's money.
The best way to predict the future is to invent it.