词汇	dumb bell shape
释义	dumb bell shape 哑呤形
随便看	Positive Feed Back Effect positive feedback link positive feedback loop positive feedback mechanism positive feedback of pipe network positive feedback path positive feedbacks positive feedback sawtooth-wave circuit positive feedback switch positive feedback traders positive feedback trading positive feedback-trading positive feed drill positive feeder positive feedfack positive feed mechanism positive feeling positive feelings positive field positive fight positive figure positive file positive filling defect positive film positive film stock