所以这个do，while，循环在检查的时候,直接中断了。
So this do while loop immediately breaks out at the point of that check.
明显的问题是NULL检查必须放在 while 循环中。
The obvious issue is that the NULL check must be part of the while loop.
首先检查一下循环系统是否正常。
First check that the circulatory system is working properly.
检查测功器水箱及补水循环系统。
Check the water tank of the dynamometer and the circulatory system of filling water.
检查测功器水箱及补水循环系统。
Check the water tank of the dynamometer and the circulatory system of filling water.
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