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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The theoretical roughness of machined surface of common metal materials can be calculated using the current formula.

普通金属材料的切削加工理论表面粗糙度可以用公式计算。

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

VOA: special.2010.12.08

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