The trial was held under tight security .
这场审讯是在戒备森严的情况下进行的。
terrorist activity that is a threat to national security
威胁国家安全的恐怖活动
The prison was ordered to tighten security after a prisoner escaped yesterday.
昨天一名囚犯越狱后,该监狱被勒令加强安全措施。
The Security Commission investigates breaches of security .
安全委员会对违反安全规定的事项进行调查。
We have been asked not to say anything for security reasons .
出于安全考虑,我们被要求守口如瓶。
The security forces opened fire, killing two people.
保安部队开枪打死了两个人。
There are strict security checks on everyone entering the Opera House.
每个人进入歌剧院都要接受严格的安全检查。
A large number of homes lack adequate security measures .
许多住宅都未采取足够的安全措施。
n. [安全]安全;保证;证券;抵押品
safety、
assurance、
certification、
commitment、
guarantee
adj. [安全]安全的;保安的;保密的
safe、
restricted