Preimage
逆象, 原象, [数]前象
🗣️ 情景例句
What are some of the other sports products you're making?
你们现在还生产哪些运动产品？
To climb stairs
爬楼梯
It has been found that certain bats emit squeaks and by receiving the echoes,
人们发现，某些蝙蝠能发出尖叫声，