A: According to my knowledge, there are many non-governmental security service companies in Beijing.
答：据我所知，在北京目前有很多民间保安公司。
According to my knowledge, we have been working on this for quite a few years.
据我所知，这个条约已经谈了好几年。
According to my knowledge, we have been working on this for quite a few years.
据我所知，这个条约已经谈了好几年。
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