中文说明：简单的原理阐释，两个正弦信号进行模拟，适合研究学习！代码结构清西，注释全面！~适合初学者进行领会学习，和掌握
English Description：
Simple principles of interpretation, two sinusoidal signals are analog, suitable for studying! Code structure Qing XI, note overall! ~ Suitable for beginners to understand learning and mastering