She changed the wheels on the smaller model, which costs about $1,900 to make.

她更换了较小型号的车轮，这款车的制造成本约为1900美元。

Swap 16 seats for hundreds, then change rubber wheels to steel, which run on tracks, and swap the batteries for copper wires.

将 16 个座位换成数百个座位，然后将橡胶轮换成钢制轮子，在轨道上运行，并将电池换成铜线。

" I'm afraid not. I don't wash as often as I eat. But there's a frothy stuff in a bottle—Snowdrop, they call it—that I use to clean my hands when I change a wheel. Perhaps that would work" . She got out the bottle from the car pocket.

“恐怕不会。我不像吃饭那样经常洗手。但是瓶子里有一种泡沫状的东西——他们称之为雪花莲——我在换轮子的时候用来洗手。也许这会起作用”。她从汽车口袋里拿出瓶子。