给定系统中的酸和碱不是绝对的，而是相互关联的。

"I don't think you can ever really understand a character until you've walked in their shoes."

The past is always carried into the present by small things.

最重要的是享受生活 - 快乐 - 这才是最重要的。

能源的未来是多样化的，没有任何单一来源会占主导地位。