The ___ of oxygen in the air rises, and at last the air beco

The ___ of oxygen in the air rises, and at last the air beco We ____ in oxygen in the air 英文翻译as the mass of air rises When we breathe,the oxygen in the air（） with our blood and g The snow is very ___(疏松)and there is a lot of air in it. take air in and out of the body等于什么 in the air on the air Things are known _when they unite with the oxygen of the air in the open air in the air是什么意思 stick in the air 英语翻译In the cold wet air she felt the last of the beer buzz e