For instance, if I wanted to change the sound that the cat is making, my God, now I have to change it on three places but like 30 places if all I've done is copy and paste.

举个例子，假如你想,改变猫的叫声，我的天啊，你现在必须改变三个地方,但是，我做了30多次复制和粘贴。

哈佛公开课 - 计算机科学课程节选

you always have to sit in the same room for three hours for multiple classes.

你必须在同一个房间为了多个课程坐三个小时。

对于古怪教授 - SpeakingMax英语口语达人

We have to decide three things: one, the name of the function.

我们必须决定三个事情：一，函数名。

哈佛公开课 - 计算机科学课程节选

.. The portfolio expected return-- x3 we have to choose three things now: x1, x2, and x3.

要计算投资组合的预期收益-,我们必须确定三个值x1，x2和。

耶鲁公开课 - 金融市场课程节选