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基于美国的
It continued the efforts, begun in 1961, by Project OSCAR—a US-based group that built and launched the very first nongovernmental satellite just four years after Sputnik.
2019年6月六级真题（第三套）阅读 Section B
英汉双解词典包含4367426条英汉词条，基本涵盖了全部常用单词的翻译及用法，是英语学习的有利工具。