英文：I hardly ever know that aluminium alloy could be as strong as steel.
中文：我几乎从来不知道铝合金竟会和钢强度一样大。
英文：Aluminium was slowly wedging its way in the metal market.
中文：当时铝正在慢慢地挤入金属市场。
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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