If these vibrations occur at a system's resonant frequency, then oscillation generates excitation and a bridge can lose its structural integrity.

如果这些振动发生在一个系统的共振频率。那振荡会形成刺激，桥便有可能失去结构完整性。

Mathematically, a current is equal to the peak current times a sine function related to the system's frequency, typically 60 Hertz.

在数学上，电流等于峰值电流乘以与系统频率相关的正弦函数，通常为 60 赫兹。