One interesting fact is a test for pure gold. Test for purity of gold, remelt and heat it.

一个有趣的事实就是黄金的检测，检测黄金的纯度，重新熔化和加热它。

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One of the most interesting features on the surface is, in fact, the shield volcanoes.

地球表面最有趣的特征之一就是盾状火山。

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I've mentioned before that one interesting fact about the downturn is that unemployment rates have doubled, across the country and across demographic groups, almost as a rule.

我曾经提到过一个有趣的事实是关于低迷期，也就是失业率双倍增加的时期，穿越国界也穿越人口群体，几乎成为一个定律。

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