Doubtfulness
n. doubtful（不大可能的）的变形
✅ 同义词
🔴 反义词
🗣️ 情景例句
I would like to send this by registered mail, please.
我想把这封信挂号寄出。
May I smoke?
我能抽烟吗？
You're welcome. But, please give it back soon.
不要客气。但是要及时还我。