计时器：本计时器可用于多种计时场合，主要是针对答辩时对时间掌握不好这种情况设计的。主要功能包括：正计时、倒计时、设置计时时间，以及设置报警时间-Timer: The timer can be used for a variety of timing applications, mainly for his reply on time to grasp this situation is not good design. Key features include: is timing, count