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1.It may describe a person who has been known for a long time but is not necessarily old in years.
也可用以指早已认识的人， 但不一定年老。收藏指正
2."For she and I were long acquainted/And I knew all her ways"(A.E. Housman).
“因为她和我早已认识／我知道她所有的样子。”（A·E·惠斯曼）收藏指正
3.The existence of Endogenous Opioid Peptide (EOP) has been known for a long time, and it has been recognized that EOP has a central paregoric effect and can regulate cardiovascular functions.
人们早已知道内源性阿片肽（Endogenous Opioid Peptide，EOP）及阿片受体的存在，并已认识到其在中枢镇痛、中枢心血管功能调节等方面的作用。收藏指正
4.The Cathaysia flora, which mainly flourished during the Permo-Carboniferous time in East Asia, has been held consistently in geology and palaeontology at home and abroad.
主要繁盛于东亚石炭二叠纪的华夏植物群（Cathaysiaflora）早已驰名中外，且在地质古生物界始终有着一致认识。收藏指正
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