氧幕

例句：

1. 1. Oxygen is essential for life on Earth.
   氧气对地球上的生命至关重要。
2. 2. The lungs need oxygen to function properly.
   肺部需要氧气才能正常运作。
3. 3. Oxygen helps burn fat and build muscle.
   氧气有助于燃烧脂肪和肌肉生长。