Restriction of wobble-plate engine is given as bevel gear, straight groove, elastomeric straight groove or 8-shape groove mechanism.

摆盘发动机的约束机构主要有圆锥齿轮、直导槽、弹性直导槽和“8”字槽等几种形式。

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For the reasons of design, construction and material aging, plate type elastomeric pad used on bridge would appear unusual deformation, cracks, glide etc.

板式橡胶支座在使用过程中，由于设计和施工的原因以及材料老化的原因，易发生异常变形、开裂、滑动支座不能滑动等病害。

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