This is the 4998th most frequent Chinese word.
金属
Metal.
The term '金属' is again a noun and highlights the category to which iron belongs, describing its physical property of magnetism.
铁是常见的金属之一，具有磁性。
Iron is one of the common metals and possesses magnetic properties.
Here, '金属' (metals) is used as a noun to represent materials comprising metallic elements.
金属是现代工业的重要组成部分。
Metals are an important component of modern industry.
In this sentence, '金属' refers to the constituents of the device, emphasizing the material composition.