The relative degree of mixture with a base metal; fineness.

成色，纯度和基本金属的相对混合程度；纯度。

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As you can see from previous image I have a Base metal layer below Red metal.

正如你在前面的图里看到的，我有一层基本金属层在红色金属下面。

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Ferrous tool materials have iron as a base metal and include tool steel, alloy steel, carbon steel, and cast iron.

黑色工具材料以铁为基材，包括工具钢，合金钢，碳钢，铸铁。

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Additionally, for a seamless appearance, all connections are housed in a solid metal base.

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In that sense, their site also taps into a heavy metal fan base and subculture that geeks out about of the same things.

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Electricity, meanwhile, is delivered via a conductive brush that sweeps around a metal ring in the stationary base.

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