The anarchic nature of the international system forces states to compete for power.

科学是一项集体事业，每一代人都为之添砖加瓦。

"A good picture book should work without any words at all."

The habits of life form the soul, and the soul forms the countenance.

"The most important thing is to stay focused on the mission."

可持续性不是选择，而是我们对下一代的责任。