What I do tend to eschew is the model where the open source product is limited in functionality in some way, and you have to buy a commercial cousin to get what you really want.

我确实对这样一种模式避而不谈，即开源产品提供的原型在某些方面存在着功能限制，所以不得不购买商业版本来满足我们的需要。

youdao

Where the principle of social proof may persuade one person to buy a product, the principle of competition may work better for someone else.

一个人可能被社会认同原则说服去购买一件产品，而在另一个人身上竞争原则则可能表现地更为有效。

youdao

Public relations activities raise awareness of the product, its principal features and benefits, as well as where to buy it.

公关活动提高产品知名度、产品主要特点和优点，以及可购买的地点。

youdao

The simple example is learning about which product to buy or where to get it from the advice of friends.

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Advertisers need to know how many people are going to buy, and where, so that the product is on shelves.

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Leading brands and major retailers use tools from the company: where-to-buy, product search engines, shopping engines and Facebook platform services.

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