Preimage
逆象, 原象, [数]前象
🗣️ 情景例句
I can't express myself very well in English.
我用英语表达不好。
How did you decide that product was safe?
你怎样决定产品是安全的呢？
I beg your pardon?Who's climbing the tree?
你说什么？谁在爬树？