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at once, at one stroke, at one time, at present, at random, at regular intervals, at school, at sea, at six, at stake,

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簧喇叭, 簧乐器, 簧盘阀, 簧片, 簧片黄铜, 簧片联轴器, 簧片振动频率, 簧片组, 簧片组合, 簧舌,