Benz(f)indane
[化] 苯并[f]二氢茚
🗣️ 情景例句
Sorry, I'm afraid I'm busy tonight.
对不起， 今晚我恐怕没空。
How much is a call to the United states?
打一个电话到美国去需要多少钱？
How was this possible?
这种传递是怎样进行的呢？