Nondestructive testing and quality control of metal hardened-depth is an important problem to be solved in machinery industry. It belongs to material property testing.
金属表面硬化层深度的检测及控制是目前机械工业部门急需解决的一个问题，它属于材料检测的范畴。
The contemporary prevalent living and material consume style means the unfairness of control of social property and the thread of human living circumstances.
当代社会盛行的物质主义的消费方式和生活方式，不仅意味着社会财富占有的不公，而且还严重地威胁着人类赖以生存的根基。
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