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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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