( securities) [] the activities involved in protecting a country, building or person against attack, danger, etc.保护措施；安全工作◆airport/hotel security机场／酒店的安全措施◆There will be round-the-clock security at the factory.这家工厂将实施 24 小时保安。⨁lax / strict / tight security马虎的／严格的／严密的安全措施⨁to improve / strengthen / tighten security改进／加强安全措施⨁a security alert / check / system安全警报／检查／制度 [] the department of a large company or organization that deals with the protection of its buildings, equipment and staff保安部门◆Security was/were called to the incident.保安人员被叫到事发现场。◆the head of security保安部门主管 [] protection against sth bad that might happen in the future担保；保证◆financial security金融担保◆Which type of investment offers the greatest security?哪一种投资的安全性最高？⨁economic / financial security经济／金融安全⨁to give (sb) / have / offer (sb) / provide (sb with) security为…提供担保 (; ) securities [] a financial asset such as a share or bond; the certificate that shows you own this证券◆to buy high-yield securities购买高收益证券◆Merrill Lynch is one of the world's biggest securities firms.美林集团是世界最大的证券公司之一。◆the change from paper to electronic securities纸质证券向电子证券的转变⨁to buy / hold / sell securities购买／持有／出售证券⨁to deal in / issue securities经营／发行证券⨁a securities business / company / dealer / firm / house证券业务／公司／交易商／企业／公司 (; ) [, ]a valuable item that you agree to give to sb if you are unable to pay back the money that you have borrowed from them抵押品◆His home and business are being held as security for the loan.他的房子和公司已被用作这笔贷款的抵押品。◆Shares in the company were pledged as security against the loan.在这家公司中持有的股份被用作该笔贷款的抵押品。⨁to give / offer / pledge sth as security将某物充当抵押品convertible security dated security employment security fixed-interest security government security job security mortgage-backed security social security