Definition: giving protection Level: B2
工人在工厂里必须穿着防护服。
Workers must wear ___protective clothing in the factory.
疫情期间，防护口罩是必不可少的。
During the pandemic, a ___protective mask was essential.
骑自行车的人应该始终佩戴防护头盔。
Cyclists should always wear a ___protective helmet.
