At one, workers wore no safety equipment.

在其中一个工厂里，工人们身上根本没有安全设备。

An inspector comes round every so often to check the safety equipment.

【often】偶尔有检查员来检查安全设备。

Ms. Hersman said investigators would talk with all the flight crew members as they try to learn about the performance of the plane's safety equipment.

赫斯曼女士表示，调查人员将和所有机组人员谈话，了解飞机安全设备性能。