质量不是巧合;它是一种结果。
Learn how to take a 20-minute power nap without embarrassment.
I don't want to be a product of my environment. I want my environment to be a product of me.
在没有生命力的帮助下合成尿素是一个极其重要的事实。
The secret of change is to focus all of your energy not on fighting the old, but on building the new.