I do not know which part of the problem and do everything possible to find a cause.
我不知道是哪一个环节出了问题，千方百计地找原因。
Is there any part of the problem over which you have control?
难题当中有没有哪一部分是你没法控制的？
It solves the problem which is the right test of coal machine draw part.
解决了采煤机牵引部准确全面试验的问题。
It solves the problem which is the right test of coal machine draw part.
解决了采煤机牵引部准确全面试验的问题。
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