哑然失笑[yǎ rán shī xiào]
词典can't help laughing：情不自禁大笑起来。
词典break into laughter：哑然失笑。
词典chuckle to oneself：窃喜，独自暗中地笑；窃窃暗笑；哑然失笑；暗暗发笑。
词典can't suppress one's laugh：哑然失笑。
哑然失笑[yǎ rán shī xiào]
\u0064\u0061\u006E\u0063\u0069\u002E\u0039\u0031\u0031\u0063\u0068\u0061\u002E\u0063\u006F\u006D
can't help laughing; break into laughter; chuckle to oneself; can't suppress one's laugh; be unable to swallow a laugh; laugh involuntarily; unable to stifle a laugh