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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。
Nothing in life is to be feared, it is only to be understood. Now is the time to understand more, so that we may fear less.
The development of modern culture is characterized by the predominance of what one might call the objective spirit over the subjective spirit.
朋友能提供的唯一帮助,就是通过举一面镜子让你看到自己高尚的形象,从而保持勇气。