Touchstone is a could turn any common metal into pure gold a small pebbles.

试金石是一块能够把任何普通金属变成纯金的一种小鹅卵石。

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The Touchstone was a small pebble that could turn any common metal into pure gold.

试金石是一种能把任何普通的金属变成纯金的小鹅卵石。

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The ultrasonic signal travels through all common metal and plastic pipe materials.

超声波信号穿过所有常见的金属和塑料管材。

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Now,you will need a common nine-volt battery and a metal piece of money.

VOA: special.2010.12.08

Heavy metal pollution is common throughout China, thanks to years of industrial development.

WSJ: Cadmium-Tainted Rice Found in Guangzhou

What's missing is there are other solutions that should be addressed, including metal health and common sense laws that keep guns out of the hands of people that shouldn't have them.

CNN: NRA clarifies its stance on arming schools

On "Stuck on the Treadmill, " for example, he plays a beefy riff in unison with Mr. Prodaniuk, a technique that found its way into early heavy metal, but which Mr. Thompson said is common in Celtic folk.

WSJ: Still Electric After All These Years | Richard Thompson | By Jim Fusilli