能量守恒定律不仅仅是一个抽象原则；它是已被无数实验验证的自然法则。

I'm the best rapper alive.

The training and improvement of labor are effective ways to increase productivity.

The evening’s the best part of the day. You’ve done your day’s work. Now you can put your feet up and enjoy it.

最好的投资是那些将利润与目标结合起来的投资。