respirator

1. N-COUNT A respirator is a device that allows people to breathe when they cannot breathe naturally, for example because they are ill or have been injured. 呼吸机; 人工呼吸器

She was so ill that she was put on a respirator. 她病得非常严重，被戴上了人工呼吸器。

2. N-COUNT A respirator is a device you wear over your mouth and nose in order to breathe when you are surrounded by smoke or poisonous gas. 防毒面具

It's smart to use a respirator if you're working with paint. 如果你工作时要使用油漆，戴上防毒面具会是明智之举。