名词 n. 1.安全,安全感。安全性[U]Two guards looked after the security of the property. 两个警卫看管财产的安全。2.防备,保安;防护,防御(措施)[U][C][(+against/from)]They tightened security during the President's visit. 他们在总统访问期间加强了安全防卫。3.保证;保障;担保(品)[U][C]A life-insurance policy may serve as security for a loan. 人寿保险可作贷款的抵押。4.证券,债券,证券业[P]He traded in securities and became rich. 他做证券交易发了财。
