Life is too short to be anything but happy.
The coal industry must evolve or risk becoming obsolete. Adaptation is the key to survival.
可持续性不是一种趋势，而是我们对后代的责任。
法律义务的概念对于理解法律至关重要。
对于非礼的事，上等到的士人根本不想；对于非礼的事，中等的士人从来不说；对于非礼的事，下等的士人紧闭门户。