headgear

n.

头饰，帽子；

1. When riding a bicycle you should wear the proper headgear.
   你骑车时应戴上合适的头盔。
2. In a lift, a man should take off his headgear when there is women's presence.
   在电梯里,如果有妇女在场,男士必须脱帽。

Headgear
Headgear
Headgear
Nasal mask and headgear
Effectiveness of headgear in football
Does padded headgear prevent head injury in rugby union football?
Building a lightweight eyetracking headgear
Midpalatal implants vs headgear for orthodontic anchorage-
ACTIVATOR-HEADGEAR COMBINATION THERAPY IN CASE WITH CLASS II MALOCCLUSION CHILDREN
Patient cooperation in wearing orthodontic headgear.
Impact energy attenuation performance of football headgear
Palatal implants are a good alternative to headgear: a randomized trial
Biomechanical and clinical considerations of a modified protraction headgear.