That can really add up if you want to host a movie night or a 3-d Olympics party with a large group.

如果你想要和一大群人举办一个电影之夜或者3d奥林匹克派对，那真的会大幅增加成本。

youdao

The Romans had to keep on cooking up new letters every time their numbers got bigger - C for 100, D for 500, M for 1, 000 - because they didn't have zeros to add on to the end.

当数字增大时，罗马人只能疲于接招，不断地创造出新的字母用来标记数字 —— C代表100，D代表500，M代表1000 —— 因为在他们的数字系统中不能将‘0’添加在数字后面。 想感觉100万有多大？

youdao

So what would I want to do? I'd like to somehow walk down each of the digits one at a time and add them up. Ah, that's a looping mechanism, right? I need to have some way of walking through them.

去取这个数的,每个数字然后把他们加起来,啊，这是个循环机制对不对？,我得找到一个遍历它们的方法,一种简单的方法可能。

麻省理工公开课 - 计算机科学及编程导论课程节选

Suppose I take a number. I'd like to add up all the digits inside of the number.

我可以用到刚刚提到的工具,来实现这个功能。

麻省理工公开课 - 计算机科学及编程导论课程节选

As soon as he gets cobia up and swimming, he'd like to add new species: "Every customer asks us what else we could do, " he says.

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