这个天平不平衡。 This pair of scales is not in equilibrium.
眼下疲劳眼睛的疼痛和疲乏,常伴有头痛,长久使用眼睛所致,或因未矫正的视力缺陷或眼肌的不平衡 Pain and fatigue of the eyes, often accompanied by headache, resulting from prolonged use of the eyes, uncorrected defects of vision, or an imbalance of the eye muscles.