The process comprises: the preparation before nitriding, the preparation period, the temperature-riseperiod and the temperature-fall period of the nitriding process.
工艺过程为：氮化前的准备工作，氮化过程的准备阶段、升温阶段和降温阶段。
2
Global temperatures began to rise slowly after 1850, with the beginning of the Modern Warm Period.
1850年后，随着现代暖期的开始，全球气温开始缓慢上升。
3
It is, true, the period of his life that established his name and fortune, that swift rise from undergraduate cabaret turn to star host on both sides of the Atlantic.