如果是词语的话，那就是:as to[æz tu:]，至于; 关于; 按着; 根据;[例句]This gave me a clue as to the source of the problem.这件事给我提供了找出问题根源的线索。As to ability, I am not your match.讲能力，我不如你。
至于： 1. to go so far as to; to go to such extent as to 2. as for; as to; as regards; with regard to; regarding; concerning; respecting; so far as ... be concerned; in the case of
