OFFICIAL 官方的, [usually before noun] made or done officially or publicly

官方的; 正式的;

formal recognition of the reformed church

改革后的教会所获得的官方承认

a formal agreement between the countries

两国间的正式协议

There is no formal structure for negotiating pay increases.

加薪谈判没有正式的框架可循。

Mr Kelly has lodged a formal complaint against the police.

凯利先生已正式投诉警方。

BEHAVIOUR 行为, [formal] behaviour is very polite, and is used in official or important situations, or with people you do not know well

正式的，庄重的;

Over the years, teaching methods have changed and become less formal.

这几年来，教学方法已有改变，不是那么正式了。

LANGUAGE 语言, formal language is used in official or serious situations

适合正式场合的;

'Yours sincerely' is a formal way of ending a letter.

Yours sincerely 是一个正式的书信结尾。

EVENT / OCCASION 事件/场合, a formal event is important, and people who go to it wear special clothes and behave very politely

正式的;

I've met her twice but only on formal occasions .

我见过她两次，但都只是在正式场合。

a formal dinner

正式的晚宴

5 CLOTHES 服装 formal dress is clothing such as a TUXEDO for men or a long dress for women, that is worn to formal events 正式场合穿的;
   OPP  casual , informal :

We insist on formal dress for dinner.

我们坚持要求穿正装赴宴。

fomal education / training / qualifications, education etc in a subject or skill, that you receive in a school, college etc rather than practical experience of it

正规教育/训练/资格:

knowledge and wisdom gained from experience rather than from formal education

通过经验而非正规教育得来的知识和智慧

ORGANIZED 有组织的, done in a very organized way

条理分明的;

The course includes formal lectures.

这门课程包括正式的讲座。

GARDEN / PARK 花园/公园, a formal garden, park, or room is arranged in a very organized way

整齐的，布置井然的;

the palace's beautifully restored formal gardens

那座宫殿经修复后美丽齐整的花园

a dance at which you have to wear formal clothes

正式的舞会

an expensive and usually long dress that women wear on formal occasions

〔女子的〕正式礼服