我经常会稍稍羽化我的选区，以避免粗糙的转换效果，这里，我选择了0.5的像素值。

I always feather my selections slightly to avoid harsh transitions, here I choose 0.5px as a value.

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然而，仅凭高cpr值并不能区分粗糙地区和冰层地区。

However, a high CPR alone can't distinguish between rough patches and regions with ice.

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法兰表面粗糙度对密封效果影响很大，特别是当采用非软质垫片时，密封表面粗糙的度值大是造成泄露的主要原因之一。

Flange surface roughness of the influence, especially sealing effect when using the soft cushion, seal surface coarse degree value big are caused by the leak is one of the main reasons why.

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