F-number
n. 数, 光圈数
🧩 词语组成解析
🗣️ 情景例句
What grade are you in?
你在几年级？
I invited him to come in, but he wouldn't.
我请他进来，但是他不肯。
Where are you going tomorrow? You said that you hoped it would be fine.
你明天打算去哪儿？你说你希望明天是个好天呢。