Preimage
逆象, 原象, [數]前象
??? 情景例句
Sure. The number is... five five five...seventeen twenty.
沒問題 號碼是555-1720。
No safe wading in an unknown water.
未知水深淺，涉水有危險。
I stopped and he asked me for a lift.
我把車停下，他向我提出要求搭車。