Otherwise, it might be recognized as a technically formal declaration of domestic war.

否则，它很可能被认为是一项内战的技术性正式声明。

youdao

The Vietnam War, for example, was attacked as unconstitutional because there was no formal declaration of war.

FORBES: The Hidden Tax Lesson In Chief Justice Roberts' Obamacare Ruling

Sudan has made no formal declaration of war, but analysts say Mr Kiir is clearly escalating the war of words.

BBC: South Sudan's Salva Kiir says Sudan has declared war

The problem here was that it was not clear that had he asked for a formal declaration of war he would have gotten one.

FORBES: What Happened To The American Declaration Of War?