Oxygen
01
氧气, O₂
a chemical element in gas form with no color that living things need for breathing
例子
Trees release oxygen into the atmosphere as a byproduct of photosynthesis.
树木通过光合作用释放氧气到大气中。
Divers carry tanks of compressed oxygen to breathe underwater.
潜水员携带压缩氧气罐在水下呼吸。
