I knew he worked for a security firm.

我知道他为一家保安公司工作。

《柯林斯英汉双解大词典》

There is no admittance without a security pass.

无保安通行证不得入内。

《牛津词典》

We have a security guard around the whole area.

我们在整个地区周围配有保安人员。

《柯林斯英汉双解大词典》

New Orleans Mayor Ray Nagin, his wife and a security guard spent several days in a hospital-like center in Shanghai,China.

VOA: special.2009.07.14

You have closed end funds, trade as a security listed on the stock exchange, but what they do is own other securities.

假如你持有封闭式基金，这种基金在证券交易所作为一种债券进行交易，但是实际上它们做的是持有其他债券。

耶鲁公开课 - 金融市场课程节选

You could not sell a security without giving a prospectus to the potential buyers and the prospectus would be something approved by the SEC.

没有招股说明书就不可以,出售证券给潜在买家,而且招股书需要通过证交会审核

耶鲁公开课 - 金融市场课程节选

Richard Escott, a security supervisor for the BBC in Cardiff, explained what he saw.

BBC: Meteor spotted in night sky in England and Wales

Place a security freeze on your credit reports if your information has not been compromised.

FORBES: Connect

In vehicle believed to have struck a concrete barrier forming part of a security chicane.

BBC: NEWS | UK | British military fatalities in Iraq