One student who had lost an eye after being hit by a plastic bullet was not given medical attention.

一名学生被塑料枪弹击中，失去了一只眼睛，却没有得到医疗护理。

We also analyse the critical velocity, at which elastic deformation translate to plastic deformation when the bullet impact the tube.

同时也分析了冲头对圆管碰撞时，导致圆管由弹性变形向塑性变形转化学的临界速度值。

In order to lighten weight, the bullet body is made of plastic materials; the bullet body is covered by a cage-shaped metal circular cylinder.

为减轻重量，弹体为塑料材料，弹体外罩有笼状金属圆筒。