More expensive kites have frames made of aluminium.

更昂贵的风筝有铝制的框架。

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The price of aluminium has fallen by half since July.

铝价自7月以来已下跌一半。

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First, a precisely crafted layer of aluminium has to be created.

首先，必须十分精巧的制作一层精密的铝层。

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Dorniers too, he says, were made of aluminium, which corrodes badly in sea water.

BBC: Dornier 17: Salvaging a rare WWII plane from the seabed

Handling an iPhone 5 will definitely remove some portion of that layer of aluminium oxide.

FORBES: Will Handling Your iPhone 5 Damage It? Maybe...

One alternative is a cable that uses a combination of aluminium and carbon-glass fibre composite.

ECONOMIST: ENERGY: Building the energy internet | The