Concaveness
n. 凹面, 成凹形
✅ 同义词
🗣️ 情景例句
Hello. This is a representative of Zhongyou Department Store.
喂，您好。我是中友百货的。
May I come in?
我能进来吗？
That's all right.Goodbye.Enjoy yourself!
不用谢。再见。好好玩吧！