青铜是人类历史上一项伟大的发明，也是金属铸造史上最早的合金。青铜发明后立刻盛行起来，从此人类也就迈进了青铜时代。青铜，作为合金的一种，包含97%的铜和3%的锌。青铜不会像铁那样生锈，几乎不受天气，具有熔点低、硬度大、可塑性强、色泽光亮等特点，非常适用于铸造。

Bronze is a great invention in the history of human beings and the earliest alloy in the history of metal casting. After the invention of bronze, it became popular immediately. From then on, human beings have entered the bronze age. Bronze, as one of the alloys, consists of 97% of copper and 3% of zinc. Bronze is not as rusty as iron, almost free from the weather, with low melting point, large hardness, strong plasticity, bright color, and so on. It is very suitable for casting.