英文：I hardly ever know that aluminium alloy could be as strong as steel.
中文：我幾乎從來不知道鋁合金竟會和鋼強度一樣大。
英文：Aluminium was slowly wedging its way in the metal market.
中文：當時鋁正在慢慢地擠入金屬市場。
英文：By mixing aluminium with other metals, scientists have been able to produce a variety of alloys, some of which have the strength of steel but weigh only one third as much.
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