su
dden
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突然, 忽然
in a way that is quick and unexpected
- Suddenly, she remembered where she had left her keys.
突然，她想起了她把钥匙放在哪里了。
- The phone rang suddenly, interrupting our conversation.
电话突然响了，打断了我们的谈话。
- It began to rain suddenly while we were playing football.
我们正在踢足球时，突然开始下雨了。
- The thunderstorm started suddenly, catching people off guard.
雷雨突然开始，让人们措手不及。
- She appeared suddenly at the doorstep, surprising her friends.
她突然出现在门口，让她的朋友们大吃一惊。
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