They use new types of guns, and birds could easily be shot down in flight, and in such great numbers that commercial hunting of ducks and geese became an industry.
他们使用新型枪支，鸟类在飞行中很容易被击落，而且数量很大，以至于商业捕猎鸭鹅成了一种行业。
2
The physics points towards a curler: if the keeper isn't fully acclimatised to the flight of the ball then the bending shot gives a bigger time advantage.