译文：年纪大了经不起生死离别，在异乡的日子里眼泪总打湿衣裳。

Tomorrow will be better for as long as America keeps alive the ideals of freedom and a better life.

To realize one’s nature perfectly---that is what each of us is here for.

The concept of reducibility is central to understanding the relationships between different computational problems.

找到方法。

最终，我们都只是等待被讲述的故事。