burst out laughing

突然笑起来

burn out, burn sth off, burn up, burn-up, burner, burning, burnish, burnous, burnt, burnt down, burnt offering, burp, burr, burriedly, burrow, bursar, bursary, burst, burst into, burst into laughter, burst out laughing (crying), burst up, burst upon, burst with, burton, bury, bus, bus lane, bus ride, bus stop, bus-driver, bus-shelter, bus-stop, busboy, busby, bush, bush telegraph, bush-baby, bushed, bushel,