Amount of downwash flow induced on the wing .

机翼上的诱导下洗量。

Flood victims scramble for food rations , dropped by pakistan army soldiers , as they battle the downwash from a pakistan army helicopter during relief operations .

灾民抢夺巴由基斯坦士兵空投的食物配给，救灾行动上他们抵抗着由陆军直升机产生的下降气流。