你要做研究，试图确定哪种媒体能够以最低的成本接触到最多的潜在客户。
You do research, trying to determine which media will reach the most potential customers for the lowest cost.
与校园演讲类似，但成本更高，然而遇见的潜在客户更多。
A similar option to the university lecture and more costly, but there's a lot of potential clients in the crowd.
从理论上来讲，市场营销只会面向潜在客户群，以此降低成本、增加营销效率。
In theory, only those customers likely to buy were targeted with marketing activity, reducing costs and increasing marketing efficiency.
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