They are seriously concerned about security.

他们非常关注安全问题。

《牛津词典》

You might wonder about security.

您可能会担忧安全性。

youdao

Think hard about security; it is hard.

要对安全性进行认真的考虑；这是很难的。

youdao

Secretary Clinton says foreign ministers also talked about security issues,including North Korea's nuclear program and the new U.S.policy of dialogue with Burma's military government.

VOA: standard.2009.11.11

But in society today, and we'll talk a bit about security topics -- and such throughout the course, for cryptography -- for encrypting things like your credit card information and bank accounts -- you don't use 32 bits, you don't use 64 bits, you generally use 1024 bits, 4,048 bits.

但在当今的社会上，我们将讨论一点安全方面的知识,贯穿整个课程，密码学-,加密一些像信用卡信息,银行账号之类的东西--你不能用32位，你也不能用64位，你通常要使用1024位，4048位。

哈佛公开课 - 计算机科学课程节选

and it's all about the security situation in the world right now between states,

它是一门关于当下各国之间安全局势的课程。

想进布朗的话 - SpeakingMax英语口语达人

Who are these young people who are so concerned about security issues on Android phones?

FORBES: Nokia Exec: 'Youth Are Pretty Much Fed Up With iPhones'

All the determinations about security, products -- those determinations are the products of direct negotiation.

WHITEHOUSE: Press Briefing

When she talks about current circumstances, Mrs Karzai is not just talking about security issues.

BBC: Zinat Karzai, Afghanistan's 'invisible' first lady