It will produce high frequency chattering around the sliding plane after the system state getting to the sliding plane , and the control variable of the system will also produce high frequency chattering so that the system would not be put into practice 但当系统运动状态到达滑动平面后，会在滑动平面附近产生高频抖振，这将会影响系统控制的精度，增加能量的消耗，并可能激发系统未建模部分的强烈振荡，以致系统难以实现。
In the course of phase transformation because phase change materials ( pcms ) have got a great deal of energy storage and release , save energy , and approve actual effect of utilization , pcms will be widely applied in the saving energy fields including the building , solar energy , exhaust heat , exhaust cool and so on 由于相变贮能材料在其物相变化过程中有大量能量的吸收和释放，可对能量进行贮存，并增加能量利用的实效性，因此在建筑、太阳能、废热、废冷等节能领域中有着广阔的前景。
Operate guidebook : grasp wolf with the mouse , press the mouse left key increment energy ; loosen to open a mouse and then throw the wolf to the half to get empty ; press mouse again left key to use greatly good fly the wolf dozen to go out ; press left key of mouse and can trigger to help to push a machine to beat wolf more far in the wolf the quilt the dozen fly the process 操作指南：用鼠标把狼抓起来，按下鼠标左键增加能量；松开鼠标就把狼抛到半空；再按鼠标左键就用大棒把狼打飞出去；在狼被打飞过程中按下鼠标左键可以触发助推器把狼打得更远
