干线(此处的“干”为简体字)可以指:

  • 干线 (交通):道路、水路、电路等连络网路的主要路线,相对于支线。繁体字写为“幹線”。
  • 干线 (气象学):陆地上一条人为想象出来的线。这条线在来自东面水体潮湿的空气与来自西面的干燥空气之间划出一道界限。繁体字写为“乾線”。

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