pitch circle of worm

例句：

1. 1. The spider has a pitch circle of worms around its web.
   蜘蛛在其网上有一个围绕它的蠕虫投食圈。
2. 2.The beetle's feeding circle is very small, only about two feet across.
   甲虫的投食圈非常小，大约只有两英尺宽。
3. 3. The scientists found that the worms were attracted to the food source and formed their own pitch circle of worms.
   科学家们发现，这些蠕虫被食物源吸引，并形成了自己的投食圈。