prep是什么词性

vague[veig]adj.模糊的subtleadj.微妙的mention['men?(?)n]v.提及hesitant['hezit(?)nt]adj.犹豫的concerning[k?n's?:ni?]prep.关于encounter[in'kaunt?;en-]v.遭遇slightly['slaitli]adv.轻微地