学校加强了消防安全措施以确保学生安全。

The school has improved fire ___safety to protect students.

工厂安装了多种安全装置，如紧急停止按钮和防护栏。

The factory installed various ___safety measures such as emergency stop buttons and guard rails.

球队需要两名优秀的安全卫来保护后场。

The team needs two talented ___safeties to protect the backfield.