在: exist; be living上课: attend class; go to class在课堂上,在上课: in class我在上课,等会打给你: estoy en clase te llamo despues在上课开始之前: before the class would start在学校, 在上课, 在求学: at school上课: 1.(学生听课) attend class; go to class 他昨天没来上课。 he didn't come to class yesterday.2.(教师讲课) conduct a class; give a lesson 学校八点开始上课。 classes begin at 8假如你在上课或在解释一个概念: gather as many facts as you can on your subject在上: aloft; come before; in front of; overhead; supra; up上课;上课;开会: have classes / lessons / a meeting不上课: skithe class给…上课: give sb. a lesson去上课: zum unterricht gehen上课,有课: have school上课;出席: attendance上课;听课: take lessons上课了: class begins上课铃: class bell上课令: attendance order上课期: length of session上课前: before class上课日: school day上课中: in class; in the class在上和在上: on&on撒在上: bescatter