Mathematical operation
un. 数学运算\\n
🧩 词语组成解析
🗣️ 情景例句
What's your new job like?
你的新工作是什么性质？
Courtesy costs nothing.
谦虚恭敬，不用分文。
In the beginning they used to carve Chinese characters on stones to record important dates in history.
开始时，他们常把汉字刻在石头上，记载历史上重要的日期。