B1 [ U ] protection of a person, building, organization, or country against threats such as crime or attacks by foreign countries保护(措施);安全(保障)
[ U, + sing/pl verb ] the group of people responsible for protecting a building保安人员
More examples
Why would a tenant agree to swap life-time security for a short-term lease?
You need some financial security when you have children.
Government bonds are a sound investment because they combine good profits and high security.
In this age of short-term contracts, job security often seems like a thing of the past.
If it's a choice between higher pay and job security, I'd prefer to keep my job.
C1 [ U ] the fact that something is not likely to fail or be lost保障;牢靠
[ U ] property or goods that you promise to give to someone if you cannot pay what you owe them保证金;担保品
investment in a company or in government debt that can be traded on the financial markets and produces an income for the investor证券;债券
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