政府加强了公共活动的安全措施。

The government has strengthened ___security measures at public events.

出于安全原因，所有访客必须通过金属探测器。

For ___security reasons, all visitors must pass through a metal detector.

他出售了可能损害我们国家安全的信息。

He sold information that may have damaged our national ___security.