mindmap root((快乐)) glad may convey polite conventional expressions of pleasure: we are so ~ you could come; or it may convey the idea of an actual lifting of spirits, delight, or even elation: a face that makes me ~. happy implies a sense of well-being and complete content: nothing made him so ~ as to be at home with his family. cheerful suggests a strong spontaneous flow of good spirits: broke into a ~ song as he strode along. (cheers祝酒干杯，cheer up打起精神、振作to become cheerful，如I wrote that song just to cheer myself up我写那首歌给自己打气，如cheer up, boy!振作起来,小伙子!如cheer up, better times may be ahead打起精神来,好日子还在后头。表示给体育队加油用cheer on，如their fans cheered them on from the sidelines支持者站在两旁加油，或直接用名词three cheers for our team为我们球队喊三次加油==hooray for our team，cheerleader是啦啦队长） lighthearted stresses freedom from worry, care, and discontent: went off to school, ~ and gay. 和gay是同义词 joyful usually suggests an emotional reaction to a situation that calls forth rejoicing of happiness or elation: heard the news with a ~ heart. joyous is more likely to apply to something that is by its nature filled with joy or a source of joy: sang song after ~ song.