雨水冲走了松散的土壤，穿透了岩石的裂缝。
Rain washes away loose soil and penetrates cracks in the rocks.
如果一只蚂蚁找到了一个出色的洞穴——比如橡子或岩石裂缝的内部——它就会叫来另一只侦察蚁对洞穴进行检查。
If an ant finds an outstanding hole—such as the inside of an acorn or a rock crevice—it recruits another scout to check it out.
水通常是自然形成的地下水，沿着岩石的裂缝渗出；不那么典型的是，水是通过从地表抽水而人工引入的。
The water is usually naturally occurring groundwater that seeps down along fractures in the rock; less typically, the water is artificially introduced by being pumped down from the surface.
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