Now there is short of thorough and delicate research in theory. The common people almost know nothing about approval sale.
目前，理论界对试用买卖制度尚缺乏深入而细致的研究，普通民众对之几乎一无所知。
Now there is short of thorough and delicate research in theory. The common people almost know nothing about approval sale.
目前，理论界对试用买卖制度尚缺乏深入而细致的研究，普通民众对之几乎一无所知。
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