safety device

Every new car now comes with at least one safety device, such as an airbag.

现在每辆新车都至少配备一种安全装置，比如安全气囊。

Please check the safety device before you start the machine.

启动机器前，请检查安全装置。

The smoke detector in the hallway is a simple safety device that alerts us to smoke.

走廊里的烟雾探测器是一种能提醒我们注意烟雾的简单安全装置。