呼吸孔

例句：

1. 1. The tree's trunk has a large air sac for breathing holes.
   这棵树的树干有一个大型的空气囊，用于呼吸。
2. 2. Insects need to breathe through these tiny openings in the bark.
   昆虫需要通过树皮上的这些小开口进行呼吸。
3. 3. The scientist discovered that some species of plants have evolved to havelarger breathing holes.
   科学家发现，一些植物物种已经进化出更大的呼吸孔。