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運転 うんてん
operation (of a machine); running; working
交換 こうかん
exchange; interchange; switching; reciprocity; barter; substitution; replacement; clearing (of checks, cheques)
器 「うつわ」「き」
bowl; vessel; container
交換器 こうかんき
(telephone) switchboard
回転 かいてん
rotation; revolution; turn; spin