Biconcavity
n. biconcave的变形
🗣️ 情景例句
It's unsafe for girls to go out alone at night.
女孩子晚上一个人外出很危险的。
Men love to hear well of themselves.
阿谀奉承话，人们皆爱听。
I entered the hotel manager's office and sat down.
我走进饭店经理的办公室，坐了下来。