But school officials said they hoped to teach students that life would require them to follow specific regulations in specific settings . " we want to instill in them a sense of modesty and a sense of community , " said school board trustee gloria pena 得州教育部门也希望通过此举告诉学生，生活要求人在特殊的年龄段接受特殊的规范教育。得州学校理事会成员皮纳指出： “我们希望向他们慢慢灌输谦逊的品质和团体意识。
A flap vlave used in pumping station is a kind of hydraulic - operated automatic gate , which is similar to a hinged check vaive . because of their simple structure and reliability , being able to shorten the length of outlet passage and facilitate the starting of pumping system in comparison with siphonic vacuum - distroied cutoff scheme . so it is propitious to be used and save investment but at the same time , flap valves always show some disadvantage 因拍门简单、可靠，与虹吸真空破坏截流闭锁方式相比，可以缩短出水管道(流道)长度，并利于泵系统起动，与快速闸门相比，拍门也有诸多优点，闸门门体易关闭不到位或卡住不能活动，因为门槽和?块较轴孔容易残留异物，闸门门体克服滑动阻力不仅无机械增益，且阻力和动力不在一直线上，门体易倾斜而自锁，而拍门的工作可靠性则远高于快速闸门。
