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。

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。

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。