This is a public good because the grade given to the paper is the same for each author, and the quality of the paper depends on the sum of the efforts of the individual authors.

因为对合作者而言，他们得到的分数都是相同的，从这个角度看它可以被称作为公共品。 而这种论文的质量依赖每个合作者的努力。

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The quality levels of cosmetic ingredients don't vary that much, andevery company that buys cosmetic-grade ingredients all buy the sam equality.

化妆品成分的质量等级相差不是很大，每家购进化妆品级原料的公司其所购物品的质量都是相同的。

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There is clearly a restructuring of the market underway, with tremendous expansion into newly emerging higher quality areas in Kowloon East and other areas once considered remote or lower grade.

很明显，目前市场已经进入了重组阶段，正向新兴的东九龙高档地段及其他曾被认为偏远或低品质的地段大举扩张。

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As a result, operators can more effectively ensure a carrier-grade quality of experience for end users of High Definition voice and video, Web conferencing, instant messaging and presence, and other broadband-intensive mobile applications that go beyond the reliability of Skype, Apple FaceTime and other services suited for consumers but inadequate for the rigors of enterprise use.

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On the great debate about commodity versus enterprise-class infrastructure components, 45% of public cloud users felt that the quality or grade of these components is highly important.

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You cannot do anything that is of a lower grade and a lower quality than what has just been done on Clash of the Titans.

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