你必须为该操作提供一个元素。

You have to provide an element for this operation.

youdao

在你那样做之前，您必须先了解一下操作范围的概念。

Before you do that, you must learn about the concept of action scopes.

youdao

所有的厨房操作台都必须足够宽，以便有充足的空间准备食物。

All worktops should be wide enough to allow plenty of space for food preparation.

《柯林斯英汉双解大词典》

I need that sanity check saying at some point, you have to stop.

在一些地方需要做那样的合法性检查，告诉你必须停止操作。

哈佛公开课 - 计算机科学课程节选

If unfamiliar, these are the mechanical computer devices that you have to use to buy a ticket on the T these days and there was one of these really awkward but touching situations where it was clear that this woman had no idea, you know, what to do, how to get from here to here, and I could see her just staring at the turnstiles that you're supposed to go through to get into the subway.

如果不熟悉，这是机械计算机设备,当今你必须使用它们来买地铁票,它们实在是难操作的,这个令人同情的情况是,明显这位老太太不知道怎样操作，怎样从这一步到那一步,我看见她只是凝视着,地铁的栅门口。

哈佛公开课 - 计算机科学课程节选