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oxygen A gaseous chemical element; an essential element in cellular respiration and in combustion processes; the most abundant element in the earth's crust and about 20% of the air by volume (一种气态化学元素,在细胞呼吸和燃烧过程中最基本的和最丰富的元素,在地壳中占20%的空气量。) | |||
gaseous oxygen | |||
oxygen | |||
oxygen gas | |||
air saturation value of dissolved oxygen; saturation level of dissolved oxygen |
氧 气 : 1263 phrases in 50 subjects |