local hardness drop 局部硬化
Application of argon arc local strengthen can increase hardness and high-temperature wear resistance of the ring groove.
采用氩弧局部强化可提高环槽的硬度和高温耐磨性。
It has been found from some investigations that TDS and hardness of drinking water correlate with the lethal rate of heart disease of the local population.
而且饮用水的硬度和总溶解性固体（ TDS）和当地居民心脏病的死亡率有确定的正相关性。
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