Preimage
逆象, 原象, [数]前象
🗣️ 情景例句
That must be Nat.
一定是Nat。
The doctor advised me to get plenty of exercise.
医生建议我多锻练。
namely 6 million million miles.) Radio waves also travel at the speed of light,
即6万亿英里）。无线电波也是以光速传播的。