That's the explanation of the difference between regional contribution rates of technological advance.
这是造成区域技术进步贡献率差异的原因。
We thank all volunteers in advance for their contribution to the growing OpenCourseWare Movement.
首先感谢所有志愿者对于促进开放式课程计画运动所做的贡献。
We thank all volunteers in advance for their contribution to the growing OpenCourseWare Movement.
首先感谢所有志愿者对于促进开放式课程计画运动所做的贡献。
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