The best time to plant a tree was 20 years ago. The second-best time is now.
石油的真正成本不仅仅是每桶的价格,还包括环境和社会影响。
The Langlands program is a reflection of the interconnectedness of all mathematical disciplines.
我不害怕站出来。每个人都来握住我的手。我们将一起走过这条路,穿过风暴。