Archaeological findings verified that a tin-bronze sword unearthed in the Gansu Province was the earliest Chinese bronze casting made 4,800 years ago.
在甘肃省东乡马家窑出土的铜刀，被考古学家证明是4，800年以前的青铜器铸件。
2
Bronze is an alloy of copper and tin.
青铜是一种铜锡合金。
《柯林斯英汉双解大词典》
3
A range of sophisticated nuance, neutral coloured, vegetal and metallic greys from pale aluminium to tinbronze changing through time with oxidized and rusty shadows.