The Earth seems to be a pretty good inertial system, because on the ground, you leave something, it stays there.

地球看上去是个不错的惯性系,因为什么东西放在地上,都会保持静止

耶鲁公开课 - 基础物理课程节选

We know that the way we enter into society is by consent, by agreement to leave the state of nature and to be governed by the majority and by a system of laws, human laws.

众所周知，只有经过同意，才能进入社会,才能脱离自然状态，并被大多数人,被人类法律体系所管辖。

耶鲁公开课 - 公正课程节选