突然一声猫叫声，吓了他一大跳。

A sudden meow made him startled.

youdao

这一次，他没有听到猫叫声。

This time he did not hear any cat noises.

youdao

有一天，小安放学回家的时候，发现一个会发出猫叫声的纸箱。

One day, when Andy got back from school, he found a cat which has been thrown away.

youdao

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