short-term mechanical properties 短期的机械性能 ; 短期的坏性能
long-term mechanical properties 长期的机械性能 ; 长期力学性能
Objective. To determine the short-term (1 week) and intermediate term (6 weeks) effects of a single PDT treatment on the mechanical and structural properties of vertebral bone.
目的：研究短期(1周)和中期(6周)内单纯的PD T疗法对脊椎骨力学和结构特性的作用。
The body structure of the whole machine is made by steel, solid and durable. The long-term use is not due to crushing material influence the mechanical properties.
全机钢制之机体结构，稳固耐用。长期使用不因粉碎物质影响机械性能。
It is more important to investigate the mechanical properties of concrete in the structures subjected to long-term sub-high temperature.
长期处于亚高温作用下的混凝土结构也需要了解其材料受力性能的变化规律。
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