security是什么意思

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security是什么意思security是什么意思security是什么意思名词n.1.安全,安全感[U]Twoguardslookedafterthesecurityoftheproperty.两

security是什么意思
security是什么意思

security是什么意思
名词 n.
1.安全,安全感[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[P]
He traded in securities and became rich.
他做证券交易发了财.