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

像约翰这样人聚集在一起，在特定迁徙路线上进行管理鹅群活。

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

但是以一定角度接近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飞行路线。