In some situations when the ranking difference between alternative decisions is too narrow a good strategy is to refine the scenarios into sub-scenarios and re-apply the method.
当候选方案的得分区别不大时，一个好的策略是把场景深化为子场景，并在子场景上应用该方法。
The addition of rare earth (re) as trace elements to aluminum or magnesium alloys can purify the melts, refine and modify the microstructure, reduce the inclusion.
稀土元素作为微量元素加入铝、镁合金中，可以净化合金熔体，细化、变质微观组织，减少夹杂。
The modified treatment by RE can refine the crystalline gain and thus, increasing the mechanical property and wear resistance significantly.
采用稀土变质处理，可使晶粒细化，从而有效地提高机械性能和抗磨性能。
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