Polereverser
换向器
🗣️ 情景例句
If you can't get a cab, give me a call. It's not safe to walk home along at night.
如果你叫不到出租车的话，打电话给我，晚上一人走回家不安全。
Arthur must send that letter soon.
亚瑟，你必须立刻投递那封信。
Thank you.
谢谢。