Series 709 features a modular design concept which facilitates complete maintenance and assembly by retaining the spring load.

系列709采用模块设计概念，弹簧负载的保持有助于全过程的维护和组装。

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And the effects of the retaining wall stiffness, strut stiffness, perforce and soil spring stiffness on the internal force and deformation of the retaining structures.

同时，论文还分别分析了围护桩墙刚度、支撑刚度、支撑预加轴力以及被动区土弹簧刚度对围护结构内力和变形的影响。

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The valve consists of an electromagnetic loop, a valve core, a replacement spring and a shell and the valve core consists of a retaining iron, a movable bar and a sealing pad.

它由电磁线圈、阀芯、复位弹簧和外壳组成，阀芯由挡铁，动杆和密封垫构成。

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Mr. Van Noten was not the only designer to do a more serious take on grunge this spring, while retaining its loose, casual spirit.

WSJ: Grunge Grows Up | Off Duty Spring 50