They don't last long no matter how careful you are.

不管你如何仔细，他们都维持不了很久。

《牛津词典》

As long as staff members are well-groomed, it does not matter how long their hair is.

只要工作人员打扮整齐，他们的头发多长不要紧。

《柯林斯英汉双解大词典》

Investors are starting to wonder how long their good fortune can last.

投资者们开始怀疑他们的好运还能持续多久。

《柯林斯英汉双解大词典》

We are worried because we do not know how long they will stay or how we will take care of them.

VOA: standard.2009.10.27

Perhaps it's clear to you that no matter how your axes are oriented, when you ask, "How long is this arrow?"

这应该是比较显然的,无论坐标轴指向哪里,当你问,"这个矢量有多长"

耶鲁公开课 - 基础物理课程节选

it doesn't matter how rich you are. So, just being able to live a long healthy life.

再富有都没用。所以健康长寿最重要。

成为教练的理由 - SpeakingMax英语口语达人

How much such handouts cost the taxpayer depends on how many people are covered, how long the subsidies last, and what share of the earnings drop is replaced.

ECONOMIST: Economics focus: Dolling up the dole | The

While Facebook can provide real names of people who "like" a product, it doesn't provide data on what sites are sending traffic to a fan page, how long visitors are spending there and how they're moving around inside it.

FORBES: Read and comment on this article on Jon Bruner's blog.

How long are we going to accept 'we'll look into it' as a solution?

CNN: June 20, 2012 -- Updated 0855 GMT (1655 HKT)