我有以下集合，代表成员(member)去健身房时的刷卡记录。{"_id":ObjectId(""),"content":{"Date_Key":"","TRANSACTION_EVENT_KEY":"","SITE_NAME":"","Swipe_DateTime":"","Gender":"","Post_Out_Code":"","Year_Of_Birth":"","Time_Key":"","MemberID_Hash":"","Member_Key_Hash":"","Swipes":""},"collection":"observations"}我想返回给定月份内每次健身房