【上位】 a person who acts and gets things done; "he's a principal actor in this affair"; "when you want something done get a doer"; "he's a miracle worker" 行動したり、何かを成したりする人。
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【上位】 an instrumentality invented for a particular purpose; "the device is small enough to wear on your wrist"; "a device intended to conserve water" 特定の目的のために発明された道具。
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