laugh in [up] one's sleeve;snigger;snicker;laugh in one's heart ;

Ignoring muffled sniggers from the lined-up children, Bob and his brothers stood perfectly still.
不顾队列中的孩子们捂着嘴暗笑, 鲍勃和他的弟妹们一声不吭地站着.
来源:词典精选例句He was close behind her and she could hear him laughing softly to himself.
他在她后面紧紧地跟着,她听见他一路吃吃地暗笑.
来源:词典精选例句She saw it all clearly from underneath her eyelashes and was both angered and secretly amused.
她眼睫毛下全看清了,又气又暗笑.
来源:汉英文学 - 围城
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