总之，情况了解得越多越有利于销售，但要注意一个原则——循序渐进，必须首

总之，情况了解得越多越有利于销售，但要注意一个原则——循序渐进，必须首先拉近与客户的距离，在取得客户的信任后，才能了解客户的其他情况。

結果 (英文) 1:

In short, the understanding of the situation the more the more conducive to sales, but pay attention to a matter of principle - step-by-step, you must first narrow the distance with customers, in order to understand the other circumstances of the customer to obtain the trust of customers.

結果 (英文) 2:

In a word, to know more conducive to sales, but must pay attention to a principle -- step by step, you must first close the distance with the customer, to win the trust of customers, and get to know other customers.

結果 (英文) 3:

In short, the more you know about how better sales, but bearing in mind the principle--step by step, you must first close the distance with customers, customer trust, to understand the customer's other cases.