seedling shoot thickness

例句：

1. 1. The baby tree is a seedling.
   这棵小树是一颗幼苗。
2. 2. The farmer planted many seedlings in the field.
   农民在田地里种植了许多幼苗。
3. 3. The young plant was a seedling.
   这棵年轻的植物是一颗幼苗。