long been known翻译
long been known的基本解释
读音: 美: 英:
早已为人所知：表示某事物或某种情况已经为人所熟知或广为人知。
例句
The ability of coal to release a combustible gas has long been known.煤能够释放易燃气体这一点早已为人所知。《柯林斯英汉双解大词典》The source had long been known but not exploited.人们早就知道这一消息来源，但没有加以利用。
It has long been known that the level of serum iron in animals falls during infection.人们早就知道，在感染期间，动物的血清铁水平会下降。
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