1. 担保，保证，保障
2. 安全，平安；安全感
3. 证券，债券
4. 保护措施
5. 抵押品；抵押
6. 安全工作
7. 保卫部门，保安部门
8. 防护，防御，防备
9. 保安，保卫
10. 可靠性

1. [U] 安全 freedom or protection from danger or worry
2. [C] [U] 抵押品 pledge
3. [P] 有价证券 documents or certificates showing who owns stock, bonds, shares, etc.

1. the state of being free from danger or injury;

   "we support the armed services in the name of national security"
   

2. defense against financial failure; financial independence;

   "his pension gave him security in his old age"
   "insurance provided protection against loss of wages due to illness"
   

3. freedom from anxiety or fear;

   "the watch dog gave her a feeling of security"
   

4. a formal declaration that documents a fact of relevance to finance and investment; the holder has a right to receive interest or dividends;

   "he held several valuable securities"
   

5. property that your creditor can claim in case you default on your obligation;

   "bankers are reluctant to lend without good security"
   

6. a department responsible for the security of the institution's property and workers;

   "the head of security was a former policeman"
   

7. a guarantee that an obligation will be met

8. an electrical device that sets off an alarm when someone tries to break in

9. measures taken as a precaution against theft or espionage or sabotage etc.;

   "military security has been stepped up since the recent uprising"
   

1.防卫;保安措施;安全工作
security refers to all the measures that are taken to protect a place, or to ensure that only people with permission enter it or leave it.

security

e.g. They are now under a great deal of pressure to tighten their airportsecurity...
他们现在承受着加强机场安保措施的巨大压力。
e.g. Strictsecurity measures are in force in the capital.
首都采取了严密的安全措施。

2.安全感;无忧无虑
A feeling ofsecurity is a feeling of being safe and free from worry.

e.g. He loves thesecurity of a happy home life...
他喜欢幸福家庭生活所带来的安全感。
e.g. If an alarm gives you that feeling ofsecurity, then it's worth carrying.
如果带着闹钟让你感到心里踏实，那就值得携带。

3.抵押品
If something issecurity for a loan, you promise to give that thing to the person who lends you money, if you fail to pay the money back.

e.g. The central bank will provide special loans, and the banks will pledge the land assecurity.
中央银行会提供特殊贷款，而这些银行会以土地作为抵押。

4.证券
Securities are stocks, shares, bonds, or other certificates that you buy in order to earn regular interest from them or to sell them later for a profit.

e.g. National banks can package their own mortgages and underwrite them as securities.
国家银行能够合并自己的抵押贷款并以证券形式包销。
e.g. ...US government securities and bonds.
美国政府证券和债券

5. see also: social security