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Collins 词频等级为 1，建议结合例句记忆，而不是只背中文释义。
已确立很长时间的。
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已确立很长时间的。；众所周知的。；得到确认的；固定下来的
Having been established for a long period of time.
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已确立很长时间的。
Having been established for a long period of time.
众所周知的。
Well-known.
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Collins 词频等级为 1，建议结合例句记忆，而不是只背中文释义。
Dictionary facts from ECDICT, WIKTIONARY.