A stretch of road outside one former army base, which offers target practice to anyone who walks in, was packed with cars.
一个从前的陆军基地外的一段公路现在成了靶场，谁想来这里练习射击都可以，靶场外挤满了汽车。
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This paper introduces the working principle and controlling characteristic and studies the PID control models of the force and displacement of the rotary Stretch-bending former.