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Officially is an adverb that means something is done or recognized by an authority, government, or organization. It can also mean something is done according to the rules or regulations set by a particular institution.

用法：

Officially is used to describe something that has been formally approved, recognized, or announced by an authoritative source. It can also be used to describe something that has been done in accordance with established rules or procedures.

例句：

1. The new policy was officially announced by the company's CEO.

新已經(jīng)被公司CEO正式宣布。

2. The government officially recognized the country's independence.

正式承認(rèn)該國(guó)的獨(dú)立地位。

3. The team was officially declared the winner of the tournament.

該隊(duì)正式被宣布為錦標(biāo)賽的獲勝者。

4. The concert was officially sold out within minutes of tickets going on sale.

門票一開售，演唱會(huì)就在幾分鐘內(nèi)被宣布售罄。

5. The movie has not been officially released yet, but it has already received rave reviews from critics.

電影還沒有正式上映，但已經(jīng)收到了評(píng)論家的好評(píng)。

同義詞及用法：

1. Formally - This adverb has a similar meaning to officially and can be used interchangeably in most cases. However, formally may also imply a sense of ceremony or tradition.

2. Legitimately - This adverb means something is done in accordance with established laws or principles and can be used as a synonym for officially in certain contexts.

3. Authoritatively - This adverb means something is done with authority and can be used to describe an official action or statement.

4. Validly - This adverb means something is done with legal or moral authority and can be used to describe an official decision or action.

5. Properly - This adverb means something is done in the correct or appropriate manner and can be used to describe an official procedure or announcement.

編輯總結(jié)：

Officially is a versatile adverb that is commonly used to describe something that has been formally approved, recognized, or announced by an authoritative source. It can also be used to describe something that has been done in accordance with established rules or procedures. When writing, it is important to use this word accurately and appropriately in order to convey the intended meaning. Additionally, using synonyms such as formally, legitimately, authoritatively, validly, and properly can add variety and depth to your writing.