Formal mathematical definition
[计] 形式数学定义
🧩 词语组成解析
formal
['fɔ:məl]
adj. （学校教育或培训）正规的;方式上的;礼仪上的;
n. <美>须穿礼服的社交集会;<口>夜礼服;
🗣️ 情景例句
Five?
5号
Hi, Jack, where do you live now?
你好，杰克，你现在住哪儿？
As quickly as they could, the men ran to th steps and up into the open, many of them with their clothes on fire.
工人们尽快朝楼梯跑去，爬上楼梯跑出舱外，其中好多人衣服已经着火了。