trunk scald

例句：

1. 1.The trunk of the tree is covered in soft bark.
   这棵树的树干覆盖着柔软的树皮。
2. 2. The sapwood is where the tree's growth begins.
   树液是树木生长的起点。
3. 3. The twigs are too small to be used for firewood.
   这些小枝太细，不能用来做柴火。