First, read the English article below.

Pay close attention to your customers reactions. Facial expressions and body language can be a big "tell" in the customer's attitude. As you pitch the product to them, remember that you are there to sell whatever is going to make the customer feel really good about their purchase. Guessing what part of the product or price the customer is objecting to will help you respond tactfully and persuasively. If a particular product seems to turn off a customer, acknowledge it rather than starting to argue for the product. You might objectively name some of its merits while justifying the customer's hesitation: "It is more expensive than the others, you're right. The hand-stitching takes a lot more time to complete, but it results in much more durable shoe." If you're working on commission, it can be tempting to always up-sell or try to get customers interested in the most expensive items. But trying to up-sell a big screen plasma TV to someone living in a dorm room that isn't big enough for it is likely to put your customer off of your sales style. Balance your desire to make a sale with what product makes sense for the customer. If the customer is having a difficult time making the decision, it's ok to do a little pushing. Trust that you have suggested the best item and ask something like  "Would you like me to bring this up to the check out stand for you while you continue your shopping?" After you confirm a sale, make the case for add-ons to up your total sales. If you've just sold a printer, mention some deals you're running on ink cartridges or reams of paper. Frame it as a money and stress-saving measure for them: "You'll need these eventually and this way you won't have to worry about it." 

Now, please write a short abstract for it in Chinese. Abstract:
首先，要做好被拒绝的心理准备。 合理选择要推销的产品。 学会一锤定音。 通过附加产品进行组合销售，提高一笔交易的成交数量。