但如果讲话者发出太多声音，回转回麦克风，环绕并行程一个循环，声音逐次变大。

But if too much of the sound from the speakers goes back into the mic it goes around and around in a loop getting louder each time.

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在实验中还发现逐次从小载荷循环增至大载荷循环的裂纹扩展速率比一次加载明显减慢。

It has been found that the crack propagation ratio obtained in the case of gradually increasing loading is smaller than that resulted from one-time loading.

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