air flask

例句：

1. 1. We need to carry an air flask in case of emergency.
   我们需要携带一个氧气罐以防万一。
2. 2. The pilot carried a small air flask with him on the flight.
   飞行员在飞行中随身携带了一个小氧气罐。
3. 3. The injured man was given an air flask to help him breathe.
   受伤的男子被给予一个氧气罐帮助他呼吸。