Just for the sake of this article, let's build a model to get a firmer grip on the notion "service".
仅仅出于文章的需要，让我们 构建一个模型来更加紧扣“服务”的概念。
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And by breaking the grip cellphone service providers had on content, Mr. Jobs opened the door for software developers in Asia and the rest of the world to reach consumers directly.
Soft, slippery, strong grip strength, good flexibility, fine performance of ozone proof, hardwearing, oil stain proof. A smaller friction factor Long service life.