当他跳入水池6英尺深的那端时，头撞到池底。
His head struck the bottom when he dived into the 6 ft end of the pool.
在该系统中，焊丝穿过电机的空心轴后从导电嘴的偏心孔送出，电机带动导电杆和偏心导电嘴旋转，从而使焊丝端部的电弧以一定直径高速旋转，以保证窄间隙焊接接头具有足够的侧壁熔深。
The hollow-axis motor drives the offset nozzle and rotates the arc on the tip of wire at high speed, so as to ensure enough penetration into the sidewalls in narrow gap welding.
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