Monendomorphism
单一自同态
🗣️ 情景例句
Mom and Dad are already on their way down to the gallery.
妈妈和爸爸已经出发去画廊了。
I hate to dust the furniture and bookcases.
我非常讨厌擦拭家具和书架上的尘埃。
What are you up to?
你在忙什么呢？