如此，遵循这条路径的蚂蚁越多，信息素信号就变得越强。
The more ants that follow the trail, the stronger it becomes.
为何如此：两个原因，事实上：其一蚂蚁不喜欢闻到醋味，其二是这样可以去掉蚂蚁爬过路径上的气味，使它们失去四处走动的路径。
Why This Works: Two reasons, really: ants hate the smell of vinegar, and it removes the scent trails that they use to get around?
他们发现了一个活跃的巢穴，并用障碍物包围起来，迫使觅食蚂蚁用特定路径回家。
They found an active nest and surrounded it with barriers that forced the foraging ants to follow a particular path back home.
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