burst into
definitions
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to enter a place suddenly and forcefullyzh: 突然闯入
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to suddenly begin to do something, especially to cry or laughzh: 突然开始做某事(尤指哭或笑)
examples
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The children burst into the room laughing.
孩子们笑着冲进房间。
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She burst into tears when she heard the news.
她听到消息时突然哭了起来。