自2010年至今的四级考试中， 共出现过 次
自2010年至今的六级考试中， 共出现过 次
N-UNCOUNT 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.
They are now under a great deal of pressure to tighten their airport security...
Strict security measures are in force in the capital.
N-UNCOUNT 安全感;无忧无虑 A feeling of security is a feeling of being safe and free from worry.
He loves the security of a happy home life...
If an alarm gives you that feeling of security, then it's worth carrying.
N-UNCOUNT 抵押品 If something is security for a loan, you promise to give that thing to the person who lends you money, if you fail to pay the money back.
The central bank will provide special loans, and the banks will pledge the land as security.
N-PLURAL 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.
National banks can package their own mortgages and underwrite them as securities.
...US government securities and bonds.