F number
焦距比数
🧩 词语组成解析
🗣️ 情景例句
My girlfriend recently broke my heart.
我的女朋友最近伤了我的心。
He is attending a morning intensive course four hours a day, six days a week.
他每周六早晨都上一门4小时的速成课。
The pictures it sent us were very disappointing because its main mirror was faulty!
它传送给我们的图像很令人失望，因为它的主要镜子有误差。