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1. Oxford Dictionary

   gully trap

   • n.
     a device inside a domestic drain which prevents the return of noxious gases from waste that has flowed through it

   • noun: gully trap

2. • 釋義

   n.

   名詞

   • 1. Australian a device inside a domestic drain which prevents the return of noxious gases from waste that has flowed through it the gully trap was inadequate to accept the flow of the three downpipes