choppers怎么读？

Recovery ships and choppers are headed for the splash - down area.宇航器回收舰和直升机朝着溅落地区前进.In between, the choppers of wounded kept coming, an endless supply of manpower and job security.直升飞机源源不断地给我们送来伤员, 我们整天有干不完的工作,根本不愁会失业....

n.斧子，斧头( chopper的名词复数 )，直升机...