One key to understanding is to realize exactly why it is that the kind of bug report non-source-aware users normally turn in tends not to be very useful.
理解问题的一个关键在于认清如下的重要事实，那就是那些对源代码知之甚少的用户所提交的错误报告通常派不上大用场。
The system has friend interface and is very easy to use, and can be very useful for choosing the welding parameters and the welding power source qualities.
该系统界面友好，简单易用，可以对焊接过程的工艺参数及焊接电源的品质选择起一定的评估作用。
This is very useful for THR measurements of velocity changes for porous reflecting surface that require light source with great power.
这对于要求大功率光源的漫反射表面速度变化的测量是极为有利的。
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