黑色金屬

hēisèjīnshǔ

Iron, manganese and chromium, also referring to steel and alloys of iron. It's the metallic material most widely used in industry.

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hei1 se4 jin1 shu3

ferrous metals (i.e. iron, chromium, manganese and alloys containing them)

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黑色金屬|黑色金属 [hēi sè jīn shǔ] ► ferrous metals (i.e. iron, chromium, manganese and alloys containing them)