a piece of metal like a screw without a point which is used with a circle of metal (= a nut ) to fasten things together 螺栓
~ of lightning a sudden flash of lightning in the sky, appearing as a line 闪电
a piece of metal like a screw without a point which is used with a circle of metal (= a nut ) to fasten things together 螺栓
~ of lightning a sudden flash of lightning in the sky, appearing as a line 闪电