The upshot seems to be that polar bears are good at hunting snow geese—at least when those geese cannot fly.
至少在雪雁无法飞行的情况下，北极熊很擅长捕食它。
Snow Geese
原声例句
经济学人-科技
经济学人-科技
Polar-bear watchers do sometimes spot their quarry chasing snow geese during the summer, when these birds have moulted and are unable to fly.
北极熊的研究人员有时会在夏季目睹北极熊费力的捕食雪雁，这时的雪雁正处于换羽时期，无法飞行。
TED演讲（视频版）双语精选
Just one polar bear needs a lot of seals, and just one seal is equal to about 74 snow geese or 216 snow goose eggs — it's a big omelet — or three million crowberries.
仅仅一只北极熊就需要很多海豹，一只海豹等同于约 74 只雪雁，或者 216 个雪雁蛋，这是个巨大的煎蛋。或者三百万颗红梅。
英语百科
Snow goose
The snow goose (Chen caerulescens), also known as the blue goose, is a North American species of goose. Its name derives from the typically white plumage. The genus of this bird is disputed. The American Ornithologists' Union and BirdLife International place this species and the other "white geese" in the Chen genus, while other authorities follow the traditional treatment of placing these species in the "gray goose" genus Anser. The scientific name is from the Latin anser, "goose", and caerulescens, "bluish", derived from caeruleus , "dark blue".
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