两位领导人会晤期间，安保非常严密。

Security was ___tight at the meeting between the two leaders.

由于先进技术，这栋大楼拥有严密的安全措施。

The building features ___tight security due to its advanced technology.

为确保安全，机场实施严格的安全检查。

To ensure safety, the airport implements ___tight security checks.