Zuòwéi fǎguān, zhèngyìgǎn shì bìbùkěshǎo de pǐnzhì.
As a judge, a sense of justice is an indispensable quality.
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memory
正义 = justice (正 upright + 义 righteousness), 感 = sense. Put together: the feeling of righteous uprightness. The 感 suffix is productive: 安全感 (sense of security), 幸福感 (sense of happiness), 责任感 (sense of responsibility).