1. burst into laughter 和 burst out laughing，意思等同，但结构不同。2. burst （动词）into laugh...
1. To bend suddenly, as in pain or laughter. 2. To share accommodations meant for one person.Idiom: on/at the double 1. Immediately. 2. In double time. [Middle English, from Old French, from Latin duplus; see dwo- in Indo-European roots.] dou′ble·ness n. American Heritage®...