F-number
n. 数, 光圈数
🧩 词语组成解析
🗣️ 情景例句
I must tell you it's the best party I've ever had.
我一点要说，我从没去过这么出色的舞会。
Don't forget to phone to let us know you arrived safely.
不要忘记打电话，告诉我们你已经安全抵达。
Take it easy!
别着急！