人类的进步史也就是人类的堕落史；而私有制的确立，是造成人类不平等及其后果的关键。

Sometimes the questions are complicated and the answers are simple.

The major credit I think Jim and I deserve... is for selecting the right problem and sticking to it.

Editing is not just about cutting and splicing; it's about finding the rhythm and soul of the story.

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。