time库中的time()和clock()有什么区别?RT

time库中的time()和clock()有什么区别?RT clock time it clock it is time for造句 what time?----At four o' clock. () time is it now? () 4 o'clock the train arrived on time at 5 o'clock 这么说对不对on time 和at 5 o'clock是否有问题如果有问题, leaving time和departure time 询问时间用time 还是clock?What the ( )是time还是clock?请说明为什么 time time Time time time time time time time time