You can use regarding to indicate the subject that is being talked or written about.
双语例句
例： He refused to divulge any information regarding the man's whereabouts.
他拒绝透露任何关于那个男人下落的消息。
例： There are conflicting reports regarding the number of terrorists involved.
在涉及的恐怖分子的数量上有相互矛盾的报导。