Many thousand years ago people learned how to domesticate animals.
数千年以前人们就学会了饲养动物。
Thousandss of years ago people had learned how to domesticate animals.
几千年以前人们就学会了饲养动物。
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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