The analysis of the problem of the finite length rod beingimpacted becomes very complex because viscoelasticity is introduced.

有限长细杆冲击问题的分析由于引入了粘弹性本构关系而变得比较复杂。

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Dr Fink's fibre consists of a hollow rod of an insulating polycarbonate material with a 30-micrometre ring of a piezoelectric polymer running along its length.

芬克博士研发出的这种纤维由一种由绝缘聚碳酸酯材料制成的空心杆组成，空心杆的内部有一种30微米的压电聚合物材料制成的环。

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L The rod has mass m and it has length l.

杆子质量为M，长度为。

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In his love of angling for trout and other freshwater fish, Walton used a long rod of spliced ash and hazelwood, with a line of about the same length as the rod, made out of woven hair from a horse's tail.

WSJ: It Has Hooked Generations of Fishermen | Izaak Walton | The Compleat Angler | By H. George Fletcher