burst

burst into和burst out的区别是意思不同、用法不同。burst into意为突然进入到某种状态或发生某种情况，其后通常要接名词。burst out意为突然进入某种状态或发生某种情况，其后通常接动名词。

例句：She read the letter and promptly burst into tears.她一看信眼泪就夺眶而出。He burst into the room without knocking.他没敲门就闯进了屋子。She burst out laughing ─ she couldn't help herself.她突然大笑起来——她控制不住自己。