Your work will be endless， but your time is finite. You cannot limit the work so you must limit your time. Hours are the only thing you can manage.

研究量子引力对于理解早期宇宙至关重要。

The fundamental impulse that sets and keeps the capitalist engine in motion comes from the new consumers' goods, the new methods of production or transportation, the new markets, the new forms of industrial organization that capitalist enterprise creates.

抑制和引导本能冲动，使其可用于更高的文化活动，是文明的基本力量。