英语语法分析

The sound radiation of viscoelastic composite sandwich plates is researched in this paper.

本文研究了夹层复合加筋板结构的振动声辐射特性。

Driving wheel groove embedded viscoelastic packing, which makes excellent mechanical properties.

驱动轮槽镶嵌粘弹性填料，具有优异的机械性能。

Being not a perfect elastic substance, wood behaves some viscoelastic properties in many respects.

木材不是完全弹性体，其力学性质具有明显的粘弹性。