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 experimental result shows that re can refine the globular grains of semisolid Al-alloy remarkably, improve the roundness and uniformity of globular grains.
结果发现：稀土显著细化了半固态铝合金的球形晶粒组织，并提高了球形晶粒的圆整度和均匀性。
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。
The results showed that sulphur and re can refine the microstructure of Cu-Pb alloy, but its fatigue strength decreases with the increase of sulphur, and increases with re.
结果表明，硫和稀土都能使铜铅合金组织细化，但硫降低其疲劳性能，而稀土能提高其疲劳性能。
The results showed that sulphur and re can refine the microstructure of Cu-Pb alloy, but its fatigue strength decreases with the increase of sulphur, and increases with re.
结果表明，硫和稀土都能使铜铅合金组织细化，但硫降低其疲劳性能，而稀土能提高其疲劳性能。
应用推荐