对71个国家从1987年到1997年十年间的R&D强度数据进行了研究.的翻译：71 countries from 1987 to 1997, R&D strength of ten years of research data. 什么意思？中文翻译英文，英文翻译中文，怎么说？

青云英语翻译

71 countries from 1987 to 1997 decade r & d intensity data were studied.

71 countries from 1987 to 1997, R&D strength of ten years of research data.

Ten year R&D intensity data has conducted the research to 71 countries from 1987 to 1997.

In the 71 states from 1987 to 1997 The 10 years &D R strength data for the study.

71 countries from 1987 to 1997, R&D strength of ten years of research data.