Preimage
逆象, 原象, [数]前象
🗣️ 情景例句
In many countries, politicians are associated with money and scandals.
在许多国家，政客与金钱和丑闻分不开。
Excuse me I couldn't write you sooner.
对不起我不能尽快给你写信。
Good idea! Shall we ask Jim?
好主意！要邀请吉姆吗？