四序是一个汉语词语，拼音是sì xù，意思是指春、夏、秋、冬四季。
哈尔滨四序分明，冬天最低气温可以达到20多度，需要穿羽绒服。
Harbin four seasons is clear , the minimum air temperature can reach more than 20 degree , needs to have down outerwear on in winter.
副热带季风气候让这座城市终年绿意洋溢的样子，花开四序，自古就有“花城”美誉。
Enjoying a subtropical monsoonal climate, Guangzhou is dotted with green trees and gorgeous flowers all year around, and has long been regarded as a beautiful "Flower City".
本文从杭州湾地区末次冰期以来的地质背景入手，分析了该区晚第四纪地层层序、深切河谷形成和演化等。
This paper analyses the stratigraphic sequence of the Late Quaternary and formation and evolution of the incised valley in the Hangzhou Bay area, on the basis of the geological setting.
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