Fake gold is common enough, but real gold can only be found by re-moving impurities and extracting it from the dross that contains it.

赝品随处可见，而真金惟有淘尽黄沙、剔除杂质之后才能得到。

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There is no doubt that cultural integration has brought benefits to us, but we should take a right attitude toward it, discarding the dross and selecting the essence.

毫无疑问，文化融合已经给我们带来了益处，但是我们应该正确对待这种文化融合，做到取其精华，去其糟粕。

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It is very easy for us to speak and theorize about faith, but God often casts us into crucibles to try our gold, and to separate it from the dross and alloy.

对别人讲说信心是很容易的事；但是，神常常将我们丢入坩埚里去提炼我们，要把贵金与劣金分别出来。

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In 1986 Mr Hindery went to work for the Chronicle Publishing Company, a San Francisco newspaper-owner that, like many old-fashioned publishers, had made some useful acquisitions but could not separate the gold from the dross.

ECONOMIST: Business deals

His reputation was forged in the refiner's fire of Sept. 11, which burned away the dross of what had been a successful but contentious two terms as New York City's mayor, a guy who reduced crime, yet picked fights with squeegee men and jaywalkers.

FORBES: As a businessman, he's been mixing with a sketchier crowd.