我把我的画笔硬度控制在0%到50%之间，以得到飞鸟锐利而清晰的边缘。
I adjusted the hardness of my brush between 0% and 50% to get sharper and more defined edges on the birds.
这通常是纯金合金与其他金属，以增加其硬度和降低其成本。
This pure gold is commonly alloyed with other metals to increase its hardness and decrease its cost.
零件表面能被低熔点金属渗透以增大密度、强度、硬度、延展性和抗冲击能力。
A part surface can be infiltrated with a low melting point metal to increase density, strength, hardness, ductility and impact resistance.
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