"I was suffering from severe arthritis in my fingers, so I wrote the first two parts at a leisurely pace, using a felt-tip pen that glided smoothly across the paper, and then typed out the last part holding two ballpoint pens upside down," she said.
这句话的upside down是修饰hold还是pens是颠倒的握着圆珠笔,还是颠倒的圆珠笔?