矿工的安全永远不应该用成本效益分析来衡量。
The best businesses are built on passion and purpose.
"I believe in the power of imagination to transform the world."
相位裕度是系统在变得不稳定之前可以容忍的程度的度量。
Little bitty stinging rain, and big old fat rain, rain that flew in side every ways.