它们只是简单地感觉到它们所处环境的变化，例如，当土堆的壁被破坏时，会改变空气的循环。
They simply sense changes in their environment, as for example when the mound's wall has been damaged, altering the circulation of air.
当吸收牛奶之后，在毛细管中挤压空气使空洞的壁开裂因而造成响声。
When a Krispie absorbs milk, the capillary forces push the air to shatter the cavities' walls -- and make a noise.
外面的空气将桶壁压得凹进走了。
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