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.
其部分原因是渦輪螺鏇槳飛機結搆堅固，部分原因是“空中拖拉機”公司生産的油箱有多層橡膠密封，一旦子彈射穿油箱，橡膠層就會自動封閉住彈孔，減緩燃油的滲漏。
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.
在某種程度上，這是由於渦輪螺鏇槳具有強健的力學特性，而部分原因是由於“空中拖拉機”的油箱有橡膠膜緊密圍繞彈孔使得泄漏減緩。

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.