Only you must take care to make my bed well and shake it diligently until the feathers fly, then it will snow in the world. * I am Frau Holle.

你千万要当心，一定要整理好我的床铺，使劲儿抖我的床垫，要抖得羽绒四处飘飞，这样世界上就下雪了。我是霍勒大妈。

youdao

However, snow can become hard and flat as it becomes older or if there have been strong winds. Then the snow's surface will help to send back sound waves.

然而，当雪下过一段时候后，或者经过大风刮过时，雪会变硬变平，因此，雪表面将有助于音波传递。

youdao

However, snow can become hard and flat as it becomes older or if there have been strong winds. Then the snow's surface will help to send back sound waves.

然而，当雪下过一段时候后，或者经过大风刮过时，雪会变硬变平，因此，雪表面将有助于音波传递。

youdao