rubber bullet

基本解释

In part this is because of the turboprops’ robust design, and in part because Air Tractor’s fuel tanks have rubber membranes which close around bullet holes to slow leaks.
其部分原因是涡轮螺旋桨飞机结构坚固，部分原因是“空中拖拉机”公司生产的油箱有多层橡胶密封，一旦子弹射穿油箱，橡胶层就会自动封闭住弹孔，减缓燃油的渗漏。
ecocn.org
In part, this is because of the robust mechanics of turboprops and in part because Air Tractor’s fuel tanks have rubber membranes which close around bullet holes to slow leaks.
在某种程度上，这是由于涡轮螺旋桨具有强健的力学特性，而部分原因是由于“空中拖拉机”的油箱有橡胶膜紧密围绕弹孔使得泄漏减缓。

A rubber bullet is a bullet made of a metal ball coated with rubber. It is intended to injure people rather than kill them, and is used by police or soldiers to control crowds during a riot.