Gold has excellent ductility, allowing it to be drawn into extremely thin wires without breaking.

ductility 是名词，由形容词 ductile（可延展的）加上名词后缀 -ity 构成。ductile 来自拉丁语 ductilis，与动词 ducere（引导、拉伸）相关。ductility 指材料能够被拉伸成细丝或薄片而不破裂的特性，即"延展性"。