stem form

例句：

1. 1. The tree's trunk is visible through the thickfoliage.
   这棵树的树干通过茂密的叶子可见。
2. 2. Thescientist studied the plant's stem form to understand itsgrowth patterns.
   科学家研究了植物的主干，以了解其生长模式。
3. 3. Theartist painted a portrait of the flower's stem form.
   艺术家画了一幅花的茎部肖像。