They provide great resistance to tension when that tension is exerted in one direction.

当向一个方向施加张力时，它们提供了极大的抗拉力。

This tie works exactly like a bowstring, balancing the arch's thrust forces with its resistance to tension.

这种系带的工作原理与弓弦完全相同，可以平衡弓的推力及其抗拉力。