1) He began to laugh.
他笑起来了。
2) She broke into a laugh.
她突然笑起来了。
3) The lady in the store began to laugh.
女店员笑了起来。
4) He burst into a fit of laughter.
他突然大笑起来。
5) He broke into a loud laugh.
他忽然大笑起来。
参考词条