Unserviceable due to excessive wear.

由于过度磨损而不可用。

A motor vehicle is discarded as unserviceable.

机动车报废的。

To damage threads to an unserviceable condition.

螺纹损坏后不可用。

Have any damaged, lost or unserviceable protective equipment replaced immediately.

及时更换任何损坏、缺失或不可使用的保护装置。

Disposal of unserviceable cylinders should only be attempted by experienced personnel.

只能由有经验的人来处理废弃钢瓶。