粒子的概念只是近似的,并且只有在动量较小的极限下才有意义。
自由民主的传播和世界经济的整合已经创造了一种情况,即大国不再愿意冒险相互开战。
To write is to resist. To resist is to write.
The true measure of a company's success is its impact on society, not just its bottom line.