No. It was mainly becasue of opportunity cost of


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送交者: skipper3 于 2005-3-07, 12:37:07:

回答: Exactly. Washing machine was invented because we were too lay to use hands 由 HunHunSheng 于 2005-3-07, 12:18:23:

spending time washing mannually exceeding the cost of purchasing a washing machine.


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