Wharton's Whitehouse underscores the difficulty facing Google in distinguishing between good quality content and bad.

沃顿商学院的怀特豪斯强调，谷歌在区分内容优劣时面临困难。

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Yet blenders and consumers have no means of distinguishing good biofuel from bad.

ECONOMIST: Can biofuels save Europe, or the planet?

This has the virtue of distinguishing between countries that follow the rules and those that don't, enforcing good behavior with carrots and bad with sticks.

WSJ: Review & Outlook: Blame It on Berlin