A rubber ball attached to a paddle by an elastic string loses energy as it flies away from the paddle.

一根弹性绳把一只皮球拴在一块叶片上当球飞离叶片时，球失去能量。

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Then we set about fixing the chosen branches along the wires with Flexi-Tie, an elastic string which allows for growth.

接着我们就要用活结把选中的树枝固定在用线弄好的支架上，要用有弹性的线才不会妨碍它们的生长。

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