因此，由于在新知识的获取方面进行合作交流，方差随着时间减少了。
Hence, the variance diminishes over time due to collaborative interaction on new knowledge acquisition.
双方欢迎两国公共和私营机构在高速铁路基础设施建设方面进行合作。
The two sides welcomed cooperation by public andprivate bodies on the development of high speedrailway infrastructure.
双方欢迎两国公共和私营机构在高速铁路基础设施建设方面进行合作。
The two sides welcomed cooperation by public and private bodies on the development of high speed railway infrastructure.
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