As these cells form they produce keratin, the substance that makes the nail body hard and durable.
这些细胞形成后会产生角蛋白，正是这种物质使得我们的指甲坚固且耐用。
Alloy steel gear, hard tooth surface, large in output torque and durable in use.
齿轮材料为合金钢，硬齿面，输出转矩大，可靠耐用。
Strong and durable hard-surface drive system makes sure the stable output and good quality.
强劲的硬齿面动力传动系统，经久耐用且保证了稳定的挤出量和优异的产品质量。
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