The special fixture is made of common iron and has the advantages of low cost, easy replacement and economy.

专用夹具为普通铁制作而成，成本低，更换方便，经济实惠。

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Pyrrhotite is a common iron sulfide in nature and is usually associated with various useful components, such as nickel, cobalt, copper, zinc and other valuable metals.

磁黄铁矿是有色金属硫化矿矿床中一种很常见的硫铁矿，其常与有价金属(如镍、钴、铜、锌等)伴生。

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"Iron is a very common mineral on, and in, the Earth".

在地球上，铁是一种常见的、普通的矿物。

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You can use a common electric iron used for pressing clothes.

VOA: special.2011.07.25

The radiation the researchers used in their testing is composed of highly charged iron particles, which are relatively common in space.

FORBES: Going To Mars Could Damage The Brains Of Astronauts

But the dozens of fragments that have been found so far point to a fairly common, stony asteroid with traces of nickel and iron.

CNN: Planet of sound: Meteor blast resonated around Earth

They said unexplained fatigue was a common problem in doctors' surgeries, but it was as yet unknown whether iron supplements could help these women.

BBC: Iron pills may help women beat fatigue