可持续性不是一种选择;它是我们对后代的责任。
Sustainability isn't a choice; it's our responsibility to future generations.
No matter what you do, always follow your heart.
学习的意愿是一种内在动机,其来源和奖励都在于其自身的实践。
我们不是在制造汽车,我们是在培养制造汽车的人。
The value of an economic model lies in its ability to explain and predict.