long-standing /ˈlɑːŋˈstændɪŋ/ adjective /ˈlɑːŋˈstændɪŋ/
adjective
Learner's definition of LONG-STANDING
: lasting or existing for a long time长期存在的；已持续很长时间的 -
It was a long-standing tradition for them to camp in the mountains for a week during the summer.夏天去山里露营一个星期是他们长期以来的惯例。
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Some long-standing problems are finally being corrected.一些长期存在的问题终于开始得到纠正。
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their long-standing relationship他们之间持久的关系