left-hand subtree

例句：

1. 1.The left-hand subtree of the tree is where the roots grow.
   这棵树的左子树是根生长的地方。
2. 2.The left-hand subtree of the forest is home to many animals.
   森林的左子树是许多动物的家园。
3. 3.The left-hand subtree of the tree is where the leaves grow.
   这棵树的左子树是叶子生长的地方。