换气孔

例句：

1. 1. The tree has many small air spaces between its leaves.
   这棵树有许多叶子之间的小空气空间。
2. 2. Insects use these air spaces to exchange gases with the environment.
   昆虫使用这些空气空间与环境交换气体。
3. 3. The scientist noticed that the air spaces in the sample were different from those in the control group.
   科学家注意到样本中的空气空间与对照组的不同。