n.保护措施;保卫部门;担保;安全;防卫;抵押品;证券;
例句:
The security zone was set up to prevent guerrilla infiltrations.
设立了安全区以防止游击队员的渗入。
He became the tool of the security services.
他成了安全部门的工具。
Large numbers of security police stood by.
大批秘密警察站在一旁。