Concavoconcave
[医] 对凹的, 双凹的
🗣️ 情景例句
That's relief.
真令人欣慰。
May I ask you a question?
我能问你个问题吗？
But this hope is always in the realms of science fiction.
但是，这种希望总是只在科幻小说中存在。