Formal system
[计] 形式系统
🧩 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
The battle was very historic.
那场战役在历史上很重要。
The remembrance of past sorrow is joyful.
记住过去的不幸使人愉快。
I had come ten miles since leaving the town,
从小镇出来，我走了10英里。