何謂 storm drain？
到底什麼叫做 storm drain? 我想不出來也查不到 "storm" 和 "drain" 有什麼關係。為什麼不寫 water drain 要用 storm drain？storm drain 跟 drain 不一樣嗎？
另外，drain 跟 sewer 差別又在哪裡？不都是下水道或下水管嗎？
Over time, cities go through stages of growth and decline. In newer cities, which haven't experienced such a decline, it can be difficult to find abandoned buildings. In these places, urban explorers may decide to go underground and explore the city's storm drains or sewers.