给定系统中的酸和碱不是绝对的,而是相互关联的。
If we want to feed the world, we must invest in smarter ways to raise livestock.
The greatest discovery of my generation is that human beings can alter their lives by altering their attitudes of mind.
The best way to cheer yourself up is to try to cheer somebody else up.
Payphone, wishing you would call me.