When one ant bumps into another, it sniffs with its antennae to find out if the other belongs to the same nest and where it has been working.

当一只蚂蚁撞击到另一只蚂蚁时，它会用它的触角去用力地嗅一嗅，以确定这只蚂蚁是否是同一个蚁巢的，与它一直在哪里觅食。