Nodular cast iron crank shaft which has not been processed by adding nitrogen, its surface fatigue strength is lower, this is the reason that results in the fracture.
球墨铸铁曲轴未经过氮化处理，表面疲劳强度低是导致曲轴断裂的原因；
Precedence or operator strength determines order of evaluation; an operator with higher precedence is evaluated before one of lower precedence.
优先级或者说操作符的强度决定求值顺序；优先级高的操作符比优先级低的操作符先求值。
Lower oil prices are welcome and better for the global economy than higher oil prices. But Monday's drop is best seen as a symptom of waning global demand than a source of strength.
对于全球经济而言，低油价好过高油价，但周一油价的下跌至多会被看作全球需求放缓的一个征兆，而非推动经济增长的力量。
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