When the window's open, the train noise is almost unbearable.

那不重要 因为大家都昏沉沉的 - 我曾经住在电车线附近。

So it's " ch, ch, ch, ch, ch... Choo-choo! " So you can think of it like making a train noise.

所以它是“ch, ch, ch, ch, ch... Choo-choo! ”所以你可以把它想象成发出火车声。