喻上下、尊卑。语出《易·履》：“上天下泽”。
史天泽(1202 ~ 1275)，永清张四营人，史天倪之弟。
History of Tin Chak (1202 ~ 1275), Yongqing Zhang four business people, the history of Ni-day brother.
他后来知道，在260英里以外纽泽西州另一个昆虫学家也观察到同一种类蚂蚁举行飞行婚礼的时间，竟和他记录的在同一天、同一个时刻！
He later learned that another entomologist in New Jersey, 260 miles away, observed a wedding flight by the same species of ant, on the same day, and at exactly the same time!
我计划中骑车九个月到印度的旅行两天前在比利时沿海港口泽布吕赫开始了。
My intended nine-month journey to India had begun two days earlier at the port of Zeebrugge on the Belgian coast.
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