The crown is the source of oxygen, worker of the magic of photosynthesis.
树冠是氧的来源，是神奇光合作用的制造者。
Plants are the main source of atmospheric oxygen.
大气中的氧主要是由植物产生的。
Operation safety of the air separation unit is the key link in the production of oxygen, which is a risk source of most difficult to control.
空分装置的安全运行是工业制氧安全生产的关键环节，也是最难控制的危险源。
Operation safety of the air separation unit is the key link in the production of oxygen, which is a risk source of most difficult to control.
空分装置的安全运行是工业制氧安全生产的关键环节，也是最难控制的危险源。
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