The aluminium body is 12% lighter than if built with steel.

用铝制作比用钢制作重量要轻12%。

《牛津词典》

If necessary, we can use aluminium instead of steel.

如果必要，我们可用铝代钢。

《新英汉大辞典》

Carbon fibre is an expensive alternative to making things in steel or aluminium, but besides being extremely strong it is also very light.

碳纤维可以被用于代替钢铁或是铝，但其造价十分昂贵；它不仅有极其强的张力，而且质地非常的轻。

youdao

It is the first commercial jet built mostly from carbon-plastic fibres rather than conventional aluminium and steel, making it more lightweight, and therefore, fuel-efficient.

BBC: Is the Boeing Dreamliner safe?

With no need to pay dividends (state firms do not have to make any transfers to central government) and little shareholder pressure to ensure that their investment is cost-effective, Chinese firms went on a capital-spending binge, concentrated in industries such as aluminium, steel, car production and cement.

ECONOMIST: The frugal giant

Both the Jabra Revo Wireless and Jabra Revo headphones are solidly constructed using an aluminium frame, steel hinges and a shatter-proof headband for extreme flexibility.

ENGADGET: Jabra readies Revo and Revo Wireless over-ear headphones, Vox in-ears