mirth: implies lightness of heart, love of gaiety, and ready laughter: family gatherings that were the occasions of much ~.           gaiety欢快，强调无忧无虑            解释中3个词以L开头


glee: stresses exultation shown in laughter, cries of joy, or sometimes malicious delight: cackled with ~ at their misfortune.   exult欢喜兴奋甚至狂喜very excited and happy because of something that has happened，如 "We won!" she exulted"我们赢了"，她狂喜道，如exult欢腾吧!，如exult in a triumph/win因为胜利无比欢喜      cackle鸡咯咯叫，嘎嘎地笑，常指幸灾乐祸地笑，同样glee也常表示幸灾乐祸(解释中的malicious delight)               《欢乐合唱团Glee》是于2009年5月19日在FOX电视台播出的青春音乐喜剧,节奏非常欢快，又如they were dancing with/in glee跳起欢快的舞蹈


jollity: suggests exuberance or lack of restraint in mirth or glee: his endless flow of jokes added to the ~.       又如his jollity is infectious他的欢乐很有感染力，本例: 他源源不断的笑话增加了欢乐


hilarity: suggests loud or irrepressible laughter or high-spirited boisterousness: a dull comedy not likely to inspire much ~.    hilarity强调大笑吵闹noisy fun or laughter，又如the idea caused great hilarity among the assembled crowd这个主意在人群中引起强烈的欢闹，如my attempt to carve the turkey was a source of great hilarity at the dinner table我切火鸡的尝试在餐桌上引起了极大的欢声笑语（欢闹）    boisterous由于情绪高亢宣泄而大声，如a boisterous crowd of partygoers一群喧闹聚会的人，在吵闹vociferous-obstreperous组


mirth欢乐: 指充满轻松欢快欢笑，glee欢喜: 强调欢喜甚至狂喜，jollity欢乐: 表示洋溢着欢乐欢喜、无拘无束，hilarity欢闹: 表示无法抑制的大笑、兴高采烈的喧闹


记忆方法: 1) 首字母MGJH联想美好感觉<==欢乐

                2) 欢乐的意思是快乐欢喜的心情mean a mood or temper of joy and high spirits that is expressed in laughter, play, or merrymaking.字母MGJH联想美好感觉<==欢乐      "乐"本意表示一种弦乐器，繁体是"樂"，引申为愉悦。欢则表示"高兴"