氧存在于空气中。
Oxygen is present in the bloodstream.
氧气存在于血管中。
They are produced in the body when too much oxygen is present.
他们在身体中存在过多的氧气的时候产生。
SF6 is safe if there is adequate oxygen present in inhaled air.
当吸入的空气中含有充足的氧气时，SF6是对人体无害的。
Oxygen is usually present as a depolarizing agent.
氧常作为去极化剂存在。
Oxygen is usually present as a depolarizing agent.
氧常作为去极化剂存在。
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