最前面就可以了,表示就...所知道的,但放在中间当插入语更为常见.例如：
No other jurisdiction,federal or provincial,to my knowledge,provides for a system of points which allows for the evaluation of general characteristics without reference to a particular List of Professions in Demand.
During those conversations,to my knowledge,I did not make decisions about who should or should not be asked to resign.