想要懂得今天，就必须研究昨天。

Sustainability in mining isn't an option—it's our license to operate.

译文：读书学习一定要放开眼界，开阔心胸；做人一定要坚守原则和底线。赏析：读书不要死记硬背，一定要放开我们的眼界，不光要知其然，还要知其所以然。做人的底线，我们应该时刻铭记，违背社会原则的事，绝对不能做。

Every body continues in its state of rest, or of uniform motion in a right line, unless it is compelled to change that state by forces impressed upon it.

You have to be passionate about what you do.