词汇	have much difficulty in
释义	have much difficulty in 很难
随便看	concentrically-compressed stub columns concentrically lamellated pattern concentrically ringed concentrically-ringed guard concentric cable concentric, cable concentric candle concentric canister Concentric Canister Launcher concentric capacitor concentric capillary technique concentric cardiac hypertrophy Concentric cardiac hypertrophy concentric casing drilling concentric cavity concentric cell technology concentric charge concentric chuck concentric circle concentric circle diagram concentric-circle grating concentric circle method concentric circle observation concentric circle radius concentric connection