Western Europe and Japan set about their research and investigation in the second half of the 1980s, and have achieved considerable progress.
西欧和日本自80年代后半期开始开展返回式卫星的研制，近些年来，获得了一些进展。
Western Europe and Japan set about their research and investigation in the second half of the 1980s, and have achieved considerable progress.
西欧和日本自80年代后半期开始开展返回式卫星的研制，近些年来，获得了一些进展。
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