我们对此一无所知
“We know nothing about it.”
THE DIALOGUE REEL
这关系到一次怎样的国际行动
“It's related to a major international operation.”
我们 对 此 一无所知
“We know nothing about it.”
如果这次行动
“If this operation”
“You will get no information from us; stop asking.”
Using chengyu like '一无所知' elevates the utterance into an authoritative, diplomatic, or legal register, often used to establish firm official boundaries.
LEARNING CHUNKS & PARTICLES
regarding this / toward this
A concise formal prepositional phrase typical of news reports, legal contexts, and professional statements.
to know absolutely nothing about something
A common four-character idiom (chengyu) used to claim complete ignorance or lack of awareness.