noun 下载 🔗分享 快乐,高兴,愉快 The state of being cheerful; joy. Examples : "Her cheerfulness brightened the classroom during the difficult test. " 在那次艰难的考试中,她的快乐感染了大家,让整个教室都明亮起来。 emotion attitude character quality mind 与AI对话词汇游戏阅读练习