Grade d: Hair and, where relevant, beard should be covered. A general protective suit and appropriate shoes or overshoes should be worn.

级：头发和胡须要覆盖，要穿戴一般工作服和合适的工作鞋或鞋套。

youdao

Grade d: Hair and, where relevant, beard should be covered. A general protective suit and appropriate shoes or overshoes should be worn.

级：头发和胡须要覆盖，要穿戴一般工作服和合适的工作鞋或鞋套。

youdao