正式的英文：
formal; official; regular
发布的英文：
publish; issue; announce; release
正式发布的英语可以用一下单词或短语:
released; ios; official launch;
[例句]还没有正式发布逮捕这些人的消息。
There has been no official announcement of the arrests.
【例句】这个文件今天正式发布。
This document is released today.
【例句】产品正式发布的时间尚未确定。
The official release of the product has not been confirmed yet.