That's, there are whole courses on that, there's some great courses here on that, it takes some mathematical sophistication, we're going to push that off a little bit.

有一些课程是专门讲这个的，那些课一般都涉及，一些复杂的数学问题，我们只是简单的讲一些基础知识。

麻省理工公开课 - 计算机科学及编程导论课程节选

Story number two,just like story number one, the spaceship takes off,and about 15 minutes later, it explodes in a horrible accident and everybody on the spaceship, including your friend,is killed.

第二个故事和第一个故事一样，飞船起飞，十五分钟后，它在可怕的事故中爆炸，船上所有人包括你的朋友都死了。

耶鲁公开课 - 死亡课程节选