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