trunk stream

例句：

1. 1.The tree's trunk is covered in moss and lichen.
   这棵树的树干上覆盖着苔藓和地衣。
2. 2. The stream runs through the forest, providing a source of water for the animals.
   这条小溪穿过森林，为动物提供水源。
3. 3.The trunk stream was so clear that we could see the fish swimming beneath us.
   这条小溪如此清澈，我们能看见鱼儿在我们下方游动。