These are called "distortion products" and happen at multiples of the fundamentaltest tone.
这些称“畸变产品”并且发生在根本测试口气的倍数。
2
Mankind's true moral test, its fundamentaltest (which lies deeply buried from view), consists of its attitude towards those who are at its mercy: animals.
Still, the fundamental requirements for a successful production environment are the same as they have ever been, and that is to test, test thoroughly, and test often!