longtime /ˈlɑːŋˈtaɪm/ adjective Learner's definition of LONGTIME
always used before a noun
: having been something specified for many years长期的;历时很久的;多年的 -
the longtime chairman of the committee任职多年的委员会主席
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longtime residents of the neighborhood这一街区的常住居民
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her longtime boyfriend/editor/manager/partner她多年的男朋友/编辑/经理/伙伴
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longtime rivals长期的竞争对手