定期拍卖机制不同。
拍卖利用市场机制，解决了一个商业难题：定价。
Auctions use the market mechanism to solve a difficult business problem: pricing.
网上拍卖作为一种新的交易机制，在商业交易中占的比重越来越大。
As a new business mechanism, online auction takes more and more proportion in the business.
网上拍卖作为一种新的交易机制，在商业交易中占的比重越来越大。
As a new business mechanism, online auction takes more and more proportion in the business.
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