The customer's perception is your reality.

自满是进步的大敌。

"In observational studies, we often have to rely on assumptions that are not directly testable."

Dreams are the seeds of greatness, but hard work is what makes them grow.

人类似乎有这样的倾向，建立一项规则叫别人遵守，同时又极力使自己成为例外，不受它的约束。