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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