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The marine pile driver has a hydraulic hammer. 水下打樁機有一個液壓鎚。
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. 他的心思可能轉曏股票市場，或他在上班途中對打樁機的駕駛操作人了迷感到新奇不已。