front-line
n.
also frontline, 1842 in the military sense, from front (adj.) (1520s, from front, n.) + line, n.. As an adjective from 1915.
词汇 | front-line |
词根词缀 | Online Etymology Dictionary front-line n. also frontline, 1842 in the military sense, from front (adj.) (1520s, from front, n.) + line, n.. As an adjective from 1915. |
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