弱弱的问一下：好像这种机子还是要用脚踏板的吧？

...it's 20th century now.....I think it's electric power.
hehe, before I came us, I also thought that the sewers are still 用脚踏板 because my family is using one which is more than 10 years old...........

是的，不过不是原来那种机械的了，是连在一根控制线上的，只有半个脚掌大，控制速度的，踩起来有点像汽车的油门，手要腾出来按着衣服。

原来是这样,

I plan to buy a sewer too. The second-hand one is the best.