A window blind has a rail, a shade, multiple guide rings, multiple release brackets and multiple cords. The training includes learning a weight for each of a set of lexical coverage features that are aggregated in the statistical machine translation model. The cover can be partially or totally removed from the stationary member during display object exchange. The other end of the support member is activated by a linking rod that is pivotably connected to the siderail on one end and to the main bed frame on the other end.