求翻译：调质处理后零件具有良好的综合机械性能，广泛应用于各种重要的结构零件，特别是那些在交变负荷下工作的连杆、螺栓、齿轮及轴类等。但表面硬度较低，不耐磨。可用调质+表面淬火提高零件表面硬度。是什么意思？

Quenched after the parts have good mechanical properties, widely used in a variety of important structural parts, especially those who work in the alternating load the rod, bolts, gears and shafts, etc. However, low surface hardness, do not wear. + Can be quenched part surface hardening to improve t

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After the quenching and retempering treatment the components have the good synthesis mechanical property, widely applies in each kind of important constructional detail, specially these the connecting rod, the bolt, the gear which works under the alternation load and the axis class and so on.But the

After tempering part has nice synthetic mechanical property, widely used in various important parts, especially those who work under alternating load-link, bolts, gears and shafts, etc. But lower surface hardness, do not wear-resistant. Available surface quench quenching and tempering + increase sur

Quenched after the parts have good mechanical properties, widely used in a variety of important structural parts, especially those who work in the alternating load the rod, bolts, gears and shafts, etc. However, low surface hardness, do not wear. + Can be quenched part surface hardening to improve t