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circlet小环小圈circular圆的循环的(circular表形容词)circulate循环流通(circulate→绕圈走→循环)circulation发生流通(circulateion)circuit环行电路(circuit走→环行)circuitous迂回的绕圈子的(circuitous)ac陪伴(ac伙伴→陪伴)accelerate加速(acceler速度→一再增加速度)acc