alternating current signal的用法和樣例：
例句
- A continuity tester injects an AC signal into the conductors of a cable to find circuit faults.
一個連續性測試器給電纜導線注入交流信號，從而找到電路故障。 - With the information and the undistorted parts, the whole spectrum can be recovered by solving the nonlinear equations, so the AC signal is also recovered.
這一先驗知識結合信號中未失真的頻譜部分，通過求解一組非線性方程即可近似恢復出交流信號的全部頻譜，從而恢復出完整的交流信號。
