空气

• They went outside for a breath of cold air .
  他们走出去呼吸一口清新的空气。
• A filter traps dust from the air .
  过滤网可存住空气中的尘埃。
• The air was warm, thick, heavy, sluggish .
  空气是那样温润、浓重，沉闷呆滞。
• They drank the tonic air there .
  他们尽情呼吸那里的新鲜空气。
• The air passage is called the air bleed .
  空气通道叫通气孔。
• Olefin gas closely approximates air .
  烯空气跟空气十分近似。
• The air is evacuated from the furnace .
  从真空炉中抽出空气。
• The vacuum valve opens to admit air .
  真空阀开启以补充空气。
• The trees tinged the air with their fragrance .
  这种树使空气带有一股清香味。
• It is not necessary to replace air with inert gas .
  不必用惰性气体置换空气。