It is well known that

...ht that（有人认为），It is considered that（有人认为），It is expected that（据期望），It is well known that（众所周知），It must be admitted that（必须承认），It must be pointed out that（必须指出），It is understood that（谁都知道），It m...

 As we all know

...⊙△⊙在维持了上面那个表情三分钟后——“哦哦哦我忘了对不起啊”所以说张艺兴反射弧可绕地球三十圈是as we all know(众所周知)的。我们经过冷静而不乏热烈的讨论之后决定用简单传统而不乏有效方便的人工呼吸抢救新人鹿晗同学。

 as we know

as we know（众所周知），古代攻城的兵力至少是守城的兵力三倍才有可能成功攻城，曹操虽说亲提五十万大军前来攻城，但是那个时候他应该也只是一方诸侯，...

 as is known to all

然而,众所周知(as is known to all),翻译题不是神马浮云,而是烫手山芋(hot potato)。考场上许多考生绞尽脑汁(rack/wrack one’s brain),抓耳挠腮,几近抓狂。