酸的强度由其提供质子的能力来衡量，碱的强度由其接受质子的能力来衡量。

You have to be able to admit when you’re wrong and get out of a losing position quickly. The worst thing you can do is hold onto a losing trade hoping it will come back.

制作一部伟大电影的关键是有一个清晰的愿景并坚持它。