Because now they have to cover the short and buy it back.

因为现在他们为了掩饰要买回来。

We found that the animals were resting more, they were traveling less, they were covering shorter distances.

Erb：我们发现动物休息得更多，它们旅行更少，它们走的距离更短。

A reindeer's coat contains two kinds of hairs: a layer of short, dense hair covered with a mesh of longer, hollow hairs.

一层短而密的毛发上面覆盖着长有中空毛发的网状结构。

The first ones would be built on a relatively small scale, covering shorter journeys like Los Angeles to San Fransisco.

第一批将以相对较小的规模建造，涵盖洛杉矶到旧金山等较短的旅程。

On September 7th it covered just short of 17m sq km, according to data tracking its daily extent from America's National Snow and Ice Data Centre (NSIDC).

根据美国国家冰雪数据中心 (NSIDC) 追踪其每日范围的数据，9 月 7 日，其覆盖面积仅接近 1700 万平方公里。