By observing the movements of visitors - they come from, what browser, how long to stay, when to leave, he will know on which part of the web, or are not working.

通过观察访问者的动向——他们从哪来，浏览了哪些内容，逗留了多长时间，何时离开，便可知道网站上哪一部份在工作，或则没有工作。

youdao

lt's a little crazy for me to be writing about migration patterns without actually knowing how they stay underwater for so long.

对我来说，在不知道它们是如何在水下呆这么久的情况下，写它们的洄游模式有点疯狂。

youdao

Whenever you say something to a person cruel or kind, you have no idea how long the words will stay with them.

每当你对一个人说一些残酷或善良的话，你不知道这些话会在他们心中停留多久。

youdao

Today,we discuss ideas about how to stay healthy on a long trip.

VOA: special.2009.07.14

" And-- "How long are you going to stay happy for?"

你们的快乐会持续多久“

哈佛公开课 - 幸福课课程节选

How long do you want to stay here?

要在这儿待多久？

How long实战 - SpeakingMax英语口语达人

By mid-week the urgent question was how long to stay in the square.

ECONOMIST: Another meaningless victory for the president of Belarus

The UK government was attempting to change the rules on who is entitled to claim benefits in the UK, he said, for example by examining claimants' leases to establish how long they planned to stay in the country.

BBC: Generic shot of people walking

You should know how long key employees have been in their roles and know how long they want to stay there.

FORBES: Micromanaging: The Secret to Getting Employees to Love You More