Fatigue failure of metal structural component is a common form of structure collapse, so improving fatigue behavior of metal materials is very important for their usage.
金属构件的疲劳失效是一种常见的结构破坏形式，改善金属材料的疲劳性能对其使用性能的提高有重要意义。
The materials mentioned above must be used carefully, or it is very likely to result in crack of plaster, which is the common problem of quality.
上述材料砌筑时稍有不慎，极易造成抹灰层裂缝，形成质量通病。
Since the selected materials are all very common drugs and reagents, the cost of the catalyst is reduced to a largest extent.
由于制备催化剂时选用的均为最普通的药品和试剂，从而在很大程度上降低了催化剂的成本。
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