N-phenylmorpholine
[建] N-苯基吗
🗣️ 情景例句
What was your speciality?
你学的是什么专业？
OK. You'll have to use a credit card or leave a $100 deposit.
好。你必须使用信用卡，否则要付100美元的押金。
Mary is still writing letters. She's been writing letters all day.
马力还在写信，她写了一整天的信。