Listen carefully at class.
“认真听讲”"Listen carefully."听讲 [词典]listen to a talk;attend a lecture;[例句]连最不感兴趣的学生都开始坐直了听讲。
Even the most apathetic students are beginning to sit up and listen 。
carefully 认真 in class 课上 （听讲就是听老师讲的，区别于听MP3之类的其它声音，没有歧义，以免被恶搞，如果你写Listen carefully in class 也可以，一般不会有问题的啦）
上课认真听讲,做好笔记以便课后复习 英文翻译：Listen carefully in class and make notes for review after class 重点词汇：Listen听; 倾听; 听信; 听从; 听着，注意听 carefully仔细地; 小心翼翼的; 诚惶诚恐地; 。
Listen to the teacher carefully at class, do some review after class.