The office of President is one which requires the utmost diligence and attention.

We must balance energy supply with environmental protection.

我最有成效的一天之一是删除了1000行代码。

森林的真正价值在于它平衡生态需求与人类愿望的能力。

学习是系统中产生的任何变化，这些变化或多或少会永久性地改变其适应环境的能力。

He allowed himself to be swayed by his conviction that human beings are not born once and for all on the day their mothers give birth to them, but that life obliges them over and over again to give birth to themselves.

The only way of discovering the limits of the possible is to venture a little way past them into the impossible.