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The marine pile driver has a hydraulic hammer. 水下打桩机有一个液压锤。
His mind may turn to the stock market or he may become fascinated by the operation of a pile driver on his way to work. 他的心思可能转向股票市场，或他在上班途中对打桩机的驾驶操作人了迷感到新奇不已。