マンホールの蓋
1. Manhole coverA manhole cover is a removable plate forming the lid over the opening of a manhole, to prevent anyone from falling in and to keep unauthorized persons out. Since the era of ancient Rome, sewer grates made from stone have been used to keep people from falling into the sewage and to catch anything large that might otherwise fall in.
Read “Manhole cover” on English Wikipedia
Read “マンホールの蓋” on Japanese Wikipedia
Read “Manhole cover” on DBpedia
Read “Manhole cover” on English Wikipedia
Read “マンホールの蓋” on Japanese Wikipedia
Read “Manhole cover” on DBpedia
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