F number
焦距比数
🧩 词语组成解析
🗣️ 情景例句
I'm in great need of your assistance.
我特别需要您的帮助。
I've had no time to prepare for this meeting, so I'll have to play it by ear.
我没有时间来准备这次会议，所以只好有什么说什么。
How much did you pay for all these things? asked her mother.
“买所有这些东西你付了多少钱？”她妈妈问。