my translation 1.not a few of large powerful enterprises manage to monopolize the market,and they like to use manipulation of penetration pricing to knock their competitors down,thereby they can occupy more market share. 2.in the case that no monopoly power in the export market,the price of product is not manipulated by manufacturing enterprises but decided by the relationship between supply and demand in the international market. 3.when enterprises manufacture and sell many kinds of products,the price of some products may be set to be very low in order to attract more customers and also make it possible for enterprises to achieve the scheduled marketing goal.