F number
焦距比数
🧩 词语组成解析
🗣️ 情景例句
I have good eyesight.
我的视力挺好。
Nothing comes wrong to a hungry man.
饥不择食。
She finished it at half past nine. She went to bed before a quarter to ten.
30 她完成了作业。她9：45之前上床睡觉。