trunk switching

例句：

1. 1. The tree was damaged during the storm, and we need to perform trunk switching to repair it.
   暴风雨中树木受损，我们需要进行树干切换来修复它。
2. 2. During the winter, trees shed their outer bark to survive in colder temperatures.
   冬天时，树木会脱落外层树皮以适应更冷的温度。
3. 3. Trees often undergo trunk switching when they are old or diseased, which helps themregenerate new growth.
   当树木老化或生病时，它们经常进行树干切换，这有助于它们重新生长新枝。