来源于外国网站，本人在学习中，推荐给正在学习的同路中人。经过测试发现很不错，对学习很有帮助，只是在测试时发现有很大杂音，如果有能力我将在今后改进。-From a foreign website, I learn, the study recommended to go the same way the human being. Been tested and found very good, very helpful in learning, just found a great noise t