说明：  著名的版本控制软件。做OpenCV移植代码到DSP上的朋友恐怕要在于老师的要求下使用这个东西吧。不过我觉得还是蛮好用的。
(Well-known version control software. Do OpenCV to DSP, porting code from a friend I am afraid that the teacher is required to use this stuff under the bar. But I think it is just fine useful.)