斜坡上的圆木,由于重力的作用会自然向下滚动。怎样才能防止圆木下滑?一个有效方法就是在圆木的下方打进个楔子。如果要想圆木既不下滑又能升高,怎么办?用过去的方法,就是连续在圆木下打进楔子。观察轨迹会发现:一个楔子是一个静止的点,一连串的楔子是一条动态的线。从实验中,可认识到持续性的重要。合理的规章制度和工作程序,能够起到与楔子相同的作用,可巩固已取得的成果,使之既不重复昨 The logs on the slopes naturally roll downwards due to the effect of gravity. How can we prevent the log from falling? One effective way is to put a wedge under the log. If you want to round wood can not fall but also rise, how to do? In the past method is to continuously into the wedge under the log. Observe the trajectory will find: a wedge is a static point, a series of wedges is a dynamic line. From the experiment, we can recognize the importance of sustainability. Reasonable rules and procedures and working procedures can serve the same purpose as wedges and consolidate the gains made so that they do not duplicate yesterday