i found a string of small black things creeping in front of me. i quietly walked over to have a look. oh，我發現前面有一串黑色的小東西在蠕動，噢， how can ants be so united? i crouched down and watched carefully. 昨天， but soon they became a line.螞蟻怎么會這么團結呢？ they are alway