In this paper, we mostly study the low temperature nitriding process of 27SiMn by surface nanocrystalline pretreatment and the frictional wear character after nitriding.
本文主要对27SiMn钢表面纳米化预处理低温渗氮工艺和氮化后的摩擦磨损特性进行了系统研究。
参考来源 - 液压支柱低温氮化及其摩擦磨损特性研究·2,447,543篇论文数据，部分数据来源于NoteExpress
A black hat is the villain or bad guy, especially in a western movie in which such a character would wear a black hat in contrast to the hero's white hat.
“黑帽”指恶棍或坏蛋，尤其在西部片里，他们一般都戴着一顶黑帽子，而跟他们对手的正面角色多戴白帽子。
It's more complicated than just figuring out what to wear in the morning, though. The class discussed how people use fashion to do everything from study history to assess character.
不过课程的内容远比搞明白每天早上穿什么要复杂的多，比如该课程还讨论人们怎样利用时尚：从用它来学习历史到用它来评估个性等。
The clothes the musicians wear – so full of character, despite the supposed uniform every orchestra dictates – can significantly affect the spectator's reception of a symphony.
且不管每个交响乐团都会提供的统一服饰，乐师们的衣着是如此的富于特色，能显著地影响观众对交响乐的接受程度。
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