Singleton
n. 一个, 独生子, 独身
🗣️ 情景例句
I can't drive a car, but I have a motorbike license.
我不会开汽车，但我有摩托车的驾驶执照。
Practice makes perfect.
熟能生巧。
Then, send two cases please.
这样的话，就送两箱吧。