Sustainability isn't an option; it's a responsibility we all share.
我不是刻意要表现得性感或怎样,我只是在做我自己。
States are rational actors that seek to maximize their relative power in order to ensure their survival in a competitive international system.
El poeta es un vidente, un profeta, un mago.
数学证明的优雅类似于精心设计的算法的美丽。
你看得越多,看到的就越多。