crawler tread

例句：

1. 1. The crawler was found under the kitchen table.
   在厨房桌子下面发现了爬行者。
2. 2. The scientists discovered tracks leading to a secret underground chamber.
   科学家们发现了通往一个秘密地下洞穴的踪迹。
3. 3. The crawler's presence in the area is causing concern among the locals.
   爬行者出现在该地区引起了当地人的担忧。