gǔ / rén / guān / chá / Yù / héng / de / wèi / zhi / yòng / lái / pàn / duàn / jì / jié / hé / fāng / xiàng

古人观察玉衡的位置，用来判断季节和方向。

People in ancient times observed Alioth's position to determine the season and direction.