唯一能让你快乐的是你自己的心。

在机器学习中，偏差和方差之间的权衡对于实现良好的泛化至关重要。

We want to build technology that everybody loves using, and that affects everyone. We want to create beautiful, intuitive services and technologies that are so incredibly useful that people use them twice a day. Like they use a toothbrush. There aren’t that many things people use twice a day.

数据库是应用程序的心脏，而应用程序是业务的心脏。

我不是为了被爱而写作，我是为了被理解而写作。

解释：市场早晨人满满的，晚上就空荡无人，这不是人们爱早市而恨晚市，而是想要买东西，所以早晨去，要买的东西晚上没有，所以离开。