何謂 storm drain?

想請問英文高手們: 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? 文選自"空中英語教室"ADVENTURE篇: Over time, cities go through stages of growth and decline. In newer cities, which haven't... 顯示更多 想請問英文高手們:
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?

文選自"空中英語教室"ADVENTURE篇:
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.
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