chemical pruning

例句：

1. 1. The chemical pruning process is crucial for the health of the trees.
   化学修剪过程对树木的健康至关重要。
2. 2. During the chemical pruning, the tree's branches were carefully trimmed back.
   在化学修剪期间，树枝被小心地修剪回来。
3. 3. The chemical pruning method was used to improve the plant's growth and development.
   使用化学修剪方法来改善植物的生长和发育。