And if the givers don't play the role of receivers every now and then, the field risks a damning perception of arrogance whereby reusing OERs becomes something that only second-class programs do.
如果者不扮演的角色，接收器不时见面，磁场风险的认知oers成为一种傲慢，再利用，只有二等节目。
He is a researcher in the field of psychophysics-the study of the perception of stimuli.
他研究的领域是精神物理学——研究外界刺激对人的观念的影响。
Vitreous hemorrhages present as hazy vision and photophobia with the perception of shadows, floaters, smoke signals, cobwebs, or lines in the visual field.
玻璃体出血表现为视物模糊和畏光，患者主诉视野中出现阴影，漂浮物，烟雾，蛛网或线条。
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