oxygen tension
... Overhangs：悬岩。 Oxygen tension：氧气密度。 Pass：山口。 ...
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液态金属氧气密度计 liquid metal oxygen densitometer
·2,447,543篇论文数据，部分数据来源于NoteExpress
两座建筑的氧气密度都在大约21%，足够让工人进入建筑，这家公司如是说。
Oxygen densities in both buildings were about 21%, high enough for workers to enter the buildings, the firm said.
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