People like John come together to manage hunting of the goose population in a particular migratory path, or flyway.

像约翰这样的人聚集在一起，在特定的迁路上进行管理鹅群的狩猎活动。

But a sleek, vertical surface approached at an angle reflects away the echoes, fooling bats into recognizing them as open flyways.

但是以一定角的光滑垂直表面会反射回声，从而愚弄蝙蝠将它们识别为开放的飞行路。