And then, when I was actually observing him walking to his dining table, it struck me, this man who finds it so difficult to walk on flat land, how does he climb a staircase?
当我看到他走去餐桌吃饭的时候， 我震惊地发现，他就连在平地上 行走都是很困难的， 更何况去爬楼梯。