您要查找的是不是：
- The air is full of millions of invisible germs. 空气中充满了许多看不见的细菌。
- The air is infected with noisome gases. 空气受到了有害气体的污染。
- The air is invisible. 空气是看不见的。
- Even though air is invisible, air takes up space. 空气虽然看不见，但它占据了空间。
- Even though air is invisible,air takes up space. 空气虽然看不见，但它占据了空间。
- For example, air is invisible and of no smell. 例如：空气是无色无味的。
- Air is invisible but we can feel its motion when there is a wind. 空气是看不见的，但有风时，我们能感觉到风的运动。
- Before mixing with the products of combustion, the air is preheated. 空气在与燃烧生成物混合之前要进行预热。
- The autumn sky is clear and the air is crisp. 秋高气爽。
- The air is gas and the diamond is a solid. 空气是气体而金钢石是固体。
- The air is not the domain of winged beasts alone. 天空并不是有翼动物的专有领域。
- The air is thin on the top of a high mountain. 高山顶上的空气稀薄。
- I can breathe better when the air is clean. 当空气很干净时，我才能呼吸的更顺畅一些。
- It is not very cold. The air is fresh today. 不太冷，今天空气较新鲜。
- The air is evacuated from the furnace. 从真空炉中抽出空气。
- The air is made up of a mixture of gases. 空气是由多种气体组合而成的。
- And this somersault in the air is one of his stunt. 这种空中翻滚可是他的绝技之一。
- The higher the mountain is,the thinner the air is. 山越高空气越稀薄。
- During a fog,the air is saturated with moisture. 下雾时空气被湿气浸透。
- For example, air is invisible. 比如：空气是看不见的。
