化学的进步以新元素的发现和分析方法的改进为标志。

理解一个国家的首要条件是去闻闻它的气味。

Every hour, she thinks, someone forges the rings, someone carves the cradle, someone loses the war.

I don't let negativity bring me down. I rise above it.

But nothing that can be said can begin to take away the anguish and the pain of these moments. Grief is the price we pay for love.

我希望网络为人类服务。它应该是人们使用的工具，而不是利用人们的技术。

教育的根是苦的，但其果实是甜的。