单词	contra-rotating
释义	contra-rotating /kɒntrərəʊˈteɪtɪŋ / adjective Rotating in the opposite direction or in opposite directions, especially about the same shaft.The valves are actuated via drag arms from twin, contra-rotating camshafts.... However, most designs still had two or more contra-rotating blades to solve the torque problem and this caused highly complex and unsound craft. Another benefit was that the contra-rotating propellers eliminated torque.
随便看	return address return air returnal return carriage return case return catch return conductor return crease return current return date return day returnee return envelope returner return fire returning board returning boomerang returning officer return key returnless return mail return match returnment return pass return path

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