A large tree might make around 100kg of O2 per year.
一棵大树每年可以产生大约100公斤的氧气。
Double add double o1, double o2.
doubleadddouble o 1, doubleo2。
氧气的化学符号是O2。
N2-O2-H2O is a model system for humid air.
H 2 O是空气-水体系的模型体系。
He has also fought at the O2 World in Berlin, Germany.
他还战斗在O2的世界在柏林，德国。
But I did perform in the O2 Arena in London last week.
不过上周确实在伦敦的O2体育馆表演过了。不知道大家有没有去看呢。
Gas exchange: The relationship of O2 and CO2 in gas and blood.
气体交换：氧气与二氧化碳在血、气中的关系。
Stop, relax, take a deep breath of O2 and join our refreshing journey.
停下急促的脚步，让乐韵和舞步送你一趟如呼吸纯氧般轻盈清新的旅程。
The production rate of O2 increased at early stage and then decreased.
产生速率在休眠前期上升，在休眠后期下降。
The blue color of the diver would indicate that there was a low O2 problem.
潜水者面部和肢端的蓝色显示有低氧问题。
The blue color of the diver would indicate that there was a low O2 problem.
潜水者面部和肢端的蓝色显示有低氧问题。
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