抽象的目的不是模糊，而是创建一个新的语义层次，在这个层次上可以绝对精确。

The present is the past rolled up for action, and the past is the present unrolled for understanding.

Investing in renewable energy and cleaner technologies is part of our commitment to a sustainable future.

自己吃饱了应当想到别人的饥饿，身上穿暖了应当想到别人的寒冷，享受安逸应当想到百姓的劳累。