r. happening unexpectedly
adv. 突然, 意外, 忽然, 迅速, 即席作成, 即刻, 急速
1. She suddenly realized that she had forgotten her keys.
她突然意识到自己忘记了钥匙。
2. The lights went out suddenly during the storm.
暴风雨中灯光突然熄灭了。
3. He suddenly started laughing at the joke.
他突然对这个笑话大笑起来。