Peacocks don 't become feather dusters overnight .
孔雀不会在一夜之间变成鸡毛掸子。
General aviation covers crop dusters , corporate jets , single-engine training aircraft and cargo aircraft , among other things .
通用航空包括农用飞机，公司专机，单发动机教练机，以及运输机等飞行物。
He says drones are also likely to be used in mass farming to replace crop dusters or even herd cattle - even traffic helicopters could also be replaced .
