chuckle to laugh quietly, especially in a private or secret way 低声轻笑：”Now that was a sight to see!” chuckled Anne as she looked at the photos. 安妮一遍看着照片一边轻声笑道，“瞧，这多可笑呀！”

　　cackle to laugh in a loud unpleasant way especially when you are taking pleasure in someone else’s bad luck （尤指幸灾乐祸地）高声大笑：The old man was cackling horribly and rubbing his hands.老头狞笑着，不停地抓挠自己的手。

　　snigger to laugh secretly and quietly, especially in an unkind way or at something that is rude （尤指刻薄地）暗笑，窃笑：The children started sniggering at Judy’s dancing .看着朱迪跳舞，孩子们开始窃笑。

　　titter to laugh quietly and unkindly when something embarrassing happens（在尴尬发生时）窃笑，哧哧地笑：The audience tittered as Brock fell through the door. 布罗克穿过门口时摔了一跤，观众们窃笑起来。

　　Get the giggle to start giggling and be unable to stop开始咯咯地笑个不停：We got the giggles in the middle of the ceremony and Sarah was furious. 典礼举行到一半时我们开始咯咯地笑个没完，萨拉为此大为光火。

　　be in hysterics/stitches to laugh in an excited and uncontrolled way狂笑不止；捧腹大笑：You should have seen his face—we were in absolute hysterics! 你当时该看看他的表情，我们个个笑得前仰后合！

　　crack up(informal 【非正式】)to suddenly start laughing at something, often in a situation when you are not supposed to （常指在不适宜的场合）突然开始大笑起来：When he told us to leave the room, we just cracked up, I’m afraid. 他叫我们离开房间时，我们却突然大笑起来。