据我所知的高级英语短语
to my knowledge
knowledge 这里是知晓的意思
例句： He always helps others to my knowledge.
据我所知，他很乐于助人。
as far as I am concerned,as far as I know.使用比较多。according to what I know也行不如上面两个用的多。
for all I know
据我所知：as far as I'm concerned
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