知道这两个扶手是干什么用的吗？
https://i.nostrimg.com/88e51762526df01a069337d5b79a735d779962a308d764db985ddb3305e756a3/file.jpg
https://i.nostrimg.com/2f5fd850dc3a7f1ce6aafabc6dbf06ee1072f0f2e41645f94461f8383e0c1aba/file.jpg