Focus on: the evaluation of Alaska sled dogs, highlighted the need to consider is that this is a drag in the polar sled dog and goods.
重点：在评判阿拉斯加雪橇犬时，需要着重考虑的是这是一种在极地拖曳雪橇和货物的狗。
2
In the nature of Arctic travel there was a reason why fourteen dogs should not drag one sled, and that was that one sled could not carry the food for fourteen dogs.