In spring it's difficult for the reindeer to pull the sledges.
在春天驯鹿就很难拉雪橇了。
As people began to domesticate animals, they trained them to pull the litters and sledges.
当人们开始驯服动物时，他们训练它们拖担架和拉雪橇。
As people began to domesticate animals, they trained them to pull the litters and sledges.
当人们开始驯服动物时，他们训练它们拖担架和拉雪橇。
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