oxygen

Scuba divers must carry tanks of compressed oxygen to breathe underwater.

(Chinese) 潜水员必须携带压缩氧气瓶才能在水下呼吸。

Plants produce oxygen during photosynthesis, which is vital for life on Earth.

(Chinese) 植物在光合作用过程中产生氧气，这对地球上的生命至关重要。