当即 (dāng jí): Immediately / At once (Adverb) — Meaning & Stroke Order

Upon hearing the alarm, the firefighters immediately interrupted their training and rushed to the scene.

Didn't you immediately refute his absurd accusation?

He did not accept the invitation at once, but said he needed to think about it for a few days.

Upon discovering ambiguity in the contract terms, the lawyers from both sides immediately commenced negotiations.