burst into laughter为什么不是burst into laught

burst into laughter为什么不是burst into laught burst into laughter/tears burst into laughter等于什么 At that joke,tom burst into laughter为什么用at burst into laughter,burst out laughing.二者用法 burst into laughter 是动词短语吗 Hearing the joke,all the students burst into ______ laughter the s news made all of us burst into laughter burst into flames是什么意思 用burst into造句 burst in与burst into的区别? burst in burst into 有什么区别