Nonequivalence
非等价, 反重合运算, “异”运算
🗣️ 情景例句
The little boy held his mother's hand firmly when crossing the street.
那小男孩过马路时紧抓着母亲的手。
Where is the ticket office?
售票处在哪儿？
What are you doing?
你在干什么？