城市的穷人就像树的根：看不见，但对生存至关重要。
The city's poor are like the roots of a tree: unseen, but essential to its survival.
物理学的美丽在于它能够用简单的原理描述复杂的事物。
没有道德的效率只是在错误方向上的速度。
The true measure of leadership is how well you empower others to achieve their full potential.
"What is a hero without love for mankind?"
安全是我们所有作业中的首要任务。