围绕地球四周的空气称为大气，大气是各种气体的混合物。空气是人类赖以生存

围绕地球四周的空气称为大气，大气是各种气体的混合物。空气是人类赖以生存的重要外界环境因素。

結果 (英文) 1:

Around the air surrounding the Earth called atmosphere, the atmosphere is a mixture of various gases. The air is important for human survival factors of the external environment.

結果 (英文) 2:

Around the air surrounding the earth called the atmosphere, air is a mixture of gases.Air is important to human survival environment factors.

結果 (英文) 3:

Four-week air known as the atmosphere around the Earth, the atmosphere is a mixture of various gases. Air is important outside environmental factors for human survival.