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
A formal contract is signed which is renewable annually.
正式签订了每年可续签的合同。
Despite its lack of formal power the nobility was not powerless.
尽管没有正式的权力,贵族阶层并非没有权势。
They decided to put their relationship on a more formal footing.
他们决定正式交往。