Concaveness
n. 凹面, 成凹形
✅ 同义词
🗣️ 情景例句
Then Grandpa, Robbie,
那么爷爷 ，Robbie，
Call the doctor!
快打电话叫医生！
He will be earning only half as much as he used to,
他将来挣的钱只有他现在的一半。