This picture was taken after the oil change had been completed.But I really wanted to show how we loosened the drain plug with the tool.See the double-headed wrench, one open and one closed.

• 这张照片是换好机油后所拍的；因为我实在很想告诉大家我是使用何种工具将洩油螺丝松开的；瞧这有双头的扳手；一头有开口；一头是圆的中间有孔的.