在内战之前，学校采用了两个日程表中的一个，而那两个日程表上都没有暑假。

Before the Civil War, schools operated on one of two calendars, neither of which included a summer vacation.

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后端从一个有两个表的简单MySQL数据库开始。

The back end starts with a simple MySQL database that has two tables.

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在获取这个序列号和使用它获取薪水之间，另一个线程可能从两个表删除员工信息。

Between obtaining the serial number and using it to obtain the salary, another thread could remove the employee from both tables.

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And then we looked at this little loop before, for i in range number of stocks, I'm going to create two different lists of stocks, one where the moves, or distributions, are chosen from a uniform, and the other where they're Gaussian.

这里的这个小循环，因为i代表股票，我会建立两个不同的股票链表，一个是代表股票价格的移动，或者说是分布，它们是从均匀分布中得出的，而另一个链表是从高斯分布中得出的。

麻省理工公开课 - 计算机科学及编程导论课程节选