F number
焦距比数
🧩 词语组成解析
🗣️ 情景例句
He isn't likely to win.
他不可能赢。
Grasp the nettle and it won't sting you.
困难像弹簧，你硬它就软。
I went further back into the cave and stopped still.
我向前走拐进岩洞，停住不动。