normal plane of worm

例句：

1. 1. The normal plane of a worm is the part of the body where it lives and moves.
   蠕虫的正常平面是它生活和移动的部分。
2. 2. The normal plane of a worm is also where its reproductive organs are located.
   蠕虫的正常平面也是其生殖器官所在的位置。
3. 3. The normal plane of a worm is crucial for understanding its behavior and development.
   蠕虫的正常平面对于理解其行为和发育至关重要。