Smooth surface, less scale, easy to be pickled.

表面光滑，氧化铁皮少，易酸洗。

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In addition to smooth fingertips, they also produce less hand sweat than the average person.

与普通人相比，除了光滑的指尖外，他们分泌的手汗也较少。

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This makes the surface less dense, but still smooth.

这样，可以减少平面的密集程度，而且可以使之更光滑。

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This makes the surface less dense, but still smooth.

这样，可以减少平面的密集程度，而且可以使之更光滑。

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