am·pli·fi·er [ˈæmplɪfaɪəʳ, 美 -ɚ] 名词
op·era·tion·al [ˌɒpərˈeɪʃənəl, 美 ˌɑ:pəˈreɪ-] 形 不变的
1. operational (in business):
2. operational (functioning):
operational 形
operational 形 MKTG
op·era·tion·al ˈam·pli·fi·er 名词 electron
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单语范例（未经PONS编辑处理）
Due to price rises after the war, operational costs rose from 681,000 in 1919 to 1,520,000 by 1922.
en.wikipedia.org The operational viability of this system remains to be seen.
en.wikipedia.org This left the wing without any operational aircraft.
en.wikipedia.org Their operational target is to be on scene within 15 minutes of the original call.
en.wikipedia.org Some of them still survive, but they are no longer operational.
en.wikipedia.org