precursor concept;
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precursor concept
前体的概念
以上为机器翻译结果，长、整句建议使用 人工翻译 。
The V-style concept goes back to almost 1953 with the XV-3 and more recently its precursor, the XV-15 back to 1977.
CENTERFORSECURITYPOLICY: Now Hear This: The Commandant Speaks Out on the V-22
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