介绍了钳形接地电阻测试仪的测试原理，即在测量时必须要有一个供电流流过的有效的闭合回路。
It describes the measure principle of the clamp grounded resister tester, that is, a effective close loop for current flow is necessary when doing the test.
根据这个原理，当歌唱者在声门的“冲开”和“闭合”环节上不能与气息相辅相成地协调工作时就会产生破音。
According to singing principle, break will take place when singer cannot coordinate breath during opening and closing of the glottis.
最后，应用最小势能原理确定位移幅值的闭合解。
Finally, a closed form solution of additional displacements is obtained by the principle of minimum potential energy.
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