Professors sell their knowledge, workers sell their labor, farmers sell their produce.
教授出售他们的知识，出售他们的劳动工人，农民出售他们的农产品。
Professors sell their knowledge, workers sell their labor, farmers sell their produce.
教授出售他们的知识，工人出卖自己的劳动力，农民出售他们的农产品。
Professors sell their knowledge, workers sell their labor, farmers sell their produce.
教授出售他们的知识，工人出卖自己的劳动力，农民出售他们的农产品。
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