1.
It is very brittle and difficult to work .
生铁很脆，很难加工。
2.
machining of difficult-to-cut metals
难加工金属材料的切削
3.
Study and Practice of Difficulty Processing Materials
难加工材料的切削加工性研究与实践
4.
High-performance Machining Strategy of Aerospace Parts Made of Difficult-to-machining Materials
难加工材料航空零件的高效加工策略
5.
The Research of EDM Pulse Generator for Difficult-To-Cut Materials;
难加工材料电火花加工脉冲电源的研究
6.
Study of the Laser-chemical Combined Etching for Hard-to-machine Material;
难加工材料激光与化学复合刻蚀加工的研究
7.
The Experimental Study on Laser Machining Combined Fulid Erosion on Difficult-to-Cut Materials
难加工材料激光和流体冲蚀复合加工试验研究
8.
Constitutive Model of 2Cr13 for Finite Element Analysis of Chip Formation Process
金属切削加工中难加工材料2Cr13的本构模型
9.
Study on the Removed Quantity of Difficult-to-machine Materials in Laser-chemical Combined Etching
难加工材料激光与化学复合加工蚀除量的研究
10.
Investigation of Small-Hole Vibration Tapping in Difficult-To-Cut Materials;
难加工材料小孔振动攻丝的试验研究
11.
Finte Element Analysis of the Processes of Grinding for Difficult-to-Machine Material
难加工材料1Cr13磨削过程的有限元分析
12.
an intractable disposition; intractable pain; the most intractable issue of our era; intractable metal.
难处理的部署；难消除的疼痛；我们时代最难处理的问题；难加工的金属。
13.
Abstract: The feature of milling3 D impeller is introduced and machining method is put forward.
介绍了一种较难加工的三元流铣制叶轮的特征,提出了加工方法。
14.
High winds compounded the difficulties of the firefighters.
大风使消防队员的灭火工作更加困难.
15.
Choosing one to both work and live with is extremely difficult!
选择伴侣一起生活、一起工作更加困难。
16.
A Study on the Cognitive Processing Mechanism of Pupils with Mathematics Learning Disabilities;
小学生数学学习困难的认知加工机制
17.
The Experimental Research of Using Low Temperature Cool-air to Process Hard-cutting Materials;
低温冷风加工难切削材料的实验研究
18.
ON DEVELOPMENT OF REFRATORY METALS INDUSTRY IN CHINA AFTER ENTERING INTO WTO;
加入WTO后我国难熔金属工业发展浅析