Interior illumination should make use of lamplight, optical line should not reflex on the salt screen and the illumination should be darker than normal illumination.
室内照明应间接地利用灯光，且光线不要直接反射至萤光屏上，使用的亮度要比平常用的暗一些。
The book Guanzi refers to "boiling Zi water to make salt ", in which"Zi" is not the Ji river but the underground brine;
《管子》一书中提到“煮泲水为盐”，“泲水”不是济水而应当是地下的卤水；“
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