as是介词词性，例如：
1、As for avoiding you， nothing could be further from my mind.至于说躲避你，我根本就没有这样的想法。
2、As for his job — well， he was very mysterious about it.至于他的工作，他总是显得非常神秘，从不多说。
3、As for food for the party， that's all being taken care of.关于聚会要用的食物，都在置办当中。
