oxygen free的用法和樣例：
例句
用作形容詞 (adj.)
- The exercises which occur without oxygen are called anaerobic.
運動中不需要氧的就是無氧運動。 - Miller thought earlier that the primitive atmosphere must be free of oxygen since oxygen may quickly destruct the randomly formed amino acids, preventing the formation of proteins.
米勒把原始大氣想象成是完全無氧的環境，因為氧氣會迅速破壞隨機產生的氨基酸，防止蛋白質的形成。
