Long ago, people used to do things for other people simply because they themselves were going to get something in return.
很久以前，人们习惯于帮助别人只是因为作为交换他们会得到一些东西。
Long ago, people used to do things for other people simply because they themselves were going to get something in return.
很久以前，人们习惯于帮助别人只是因为作为交换他们会得到一些东西。
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