我们都被自己过去的影子所困扰。
We are all haunted by the shadows of our former selves.
The dead are never really gone, they just change form.
复杂容易,简单难。
函数是一种对应规则,通过它当给定任何东西(作为参数)时,可以获得另一个东西(该参数的函数值)。
Optimism is not just a trait; it's a skill that can be cultivated.