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R.O.T.C.
[R.O.T.C. 词源字典]
also
ROTC
, 1916, American English, initialism (acronym) for
Reserve Officers' Training Corps
, established as part of the National Defense Act of 1916.
[R.O.T.C. etymology, R.O.T.C. origin, 英语词源]
[R.O.T.C. 词源字典]