burst 的核心是「内部压力积压后的突然释放」——气球炸裂是 burst，突然哭出来是 burst into tears，突然大笑是 burst out laughing，管道爆裂也是 burst。与 break out 的区别：break out 用于疾病/战争/火灾等「大规模事件的爆发」，burst 更强调「突然、剧烈的爆发」，多用于情绪或物理炸裂。
释义
1
v.爆裂；胀破（物理）
The water pipe burst during the cold winter night.
寒冷的冬夜里，水管爆裂了。
2
v.突然爆发（情绪）
She burst into tears when she heard the news.
听到这个消息，她突然哭了出来。
3
n.爆发；突发（burst of）
There was a sudden burst of applause from the audience.
观众中突然爆发出一阵掌声。
语感
burst into tears/laughter = 突然哭/笑，比 start crying 更有「绷不住了」的爆发感
爆裂突然爆发突然哭/笑（burst into）
两个高频结构：burst into sth. + 名词（tears / laughter / flames / song）= 突然进入某状态；burst out doing（burst out laughing / burst out crying）= 突然做某事。两者意思相近，区别在于：burst into + 名词，burst out + 动名词。与 break out：war broke out（战争爆发）/ disease broke out（疾病爆发）——break out 用于抽象大规模事件，burst 用于具体爆发和情绪。
陷阱
⚠️burst into vs burst out 结构差异
✗
She burst into laughing when she saw the clown.
看到小丑她突然大笑起来。
burst into 后接名词（laughter），burst out 后接动名词（laughing）；burst into laughing 是混用
✓
She burst out laughing / burst into laughter when she saw the clown.
看到小丑，她突然大笑起来。
⚠️burst vs break out 场景区分
A conflict broke out between the two groups.
✗
换用 burst：A conflict burst between the two groups（不自然）