例句與造句

1. According to this model, three sources of information must be present in order to maintain visual constancy and successfully determine the direction of a target displacement : the target position prior to the saccade, extra retinal information, and a retinal error signal from the corrective saccade to determine the actual direction of target movement by comparing it to the efference copy and proprioceptive inflow ( Deubel et al ., 1996 ).
2. It's difficult to find visual constancy in a sentence. 用visual constancy造句挺難的