突然 /tʰu˥ jan˧˥/ AdverbEnglishsuddenlyEnglishsuddenlyExample我忽然意识到我忘记带钥匙了。(猛然 / 刹那 / 顷刻) — 我忽然意识到我忘记带钥匙了。I suddenly realized I had forgotten my keys.忽然强调思维或状态的即时转变。