This is especially true for the harder materials of construction.
对于较硬的建材更是如此。
"You can make materials that are harder or softer," says Matyjaszewski. "Every self-healing material is somehow unique and has advantages over the other ones."
Matyjaszewski说，“材料的制作可硬可软，每种自我修复材料都具有一定的独特性和优越性。”
Harder, less abrasive materials require slower spindle speeds and softer, more abrasive materials need faster spindle speeds.
哈德，减少研磨材料需要主轴速度慢和软，更磨料需要更快的主轴转速。
These materials are also often harder to machine making it more difficult to produce smooth threads.
这些材料通常还难以加工，难以制造出光滑的螺纹。
Some started using harder craft papers, some were using papers made of silk, and some used non-woven materials-like the stuff found for umbrellas.
有人开始用工艺纸，一些人用绢纸，还有人用非织品材料，比如说一些制伞材料。
The technology has the advantages of thin kerf, increased cutting speed, good quality, elimination of hazardous waste slurry and ability to machine harder brittle and bigger dimension materials.
该技术具有切缝窄、锯切效率高、切片质量好、对环境污染小、能加工大直径工件和超硬材料等优点。
As transistors get smaller, however, laying down n-type and p-type materials in proximity gets harder, thanks once again to fluctuations in the concentrations of dopants.
然而，晶体管越小，制造PN结的难度就越大，这也是受到了掺入元素浓度波动的影响。
P95 A compression test is used for brittle materials such as concrete, stone, and brick because their tensile strength is low and thus harder to measure accurately.
脆性材料例如混凝土石材和砖是做抗拉实验的。因为它们的抗拉强度很低，很难准确地测量。
P95 A compression test is used for brittle materials such as concrete, stone, and brick because their tensile strength is low and thus harder to measure accurately.
脆性材料例如混凝土石材和砖是做抗拉实验的。因为它们的抗拉强度很低，很难准确地测量。
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