Achievement on Science and Technology
南北朝时期的科技成就
During this period of near-constant political and military strife, achievements on agriculture,chronometer and mechanical manufacture found a farther way.
在这个充满了不断的政治与军事冲突的年代，农业、计时器和机械制造上却取得了更加深入的成就。
Jia Sixie who is a viceroy of Northern Wei compiled a book named Essential Skills in Improving People’s Life in which he summed up laboring people’s experience and skills in farming and husbandry.
北魏官员贾思勰一本名为《齐民要术》的书，在书中他总结了劳动人民在农业与饲养方面的经验与技能。
The practice of some advanced skill of planting and drought control narrated in the book had been proved to be effective.
其中一些有关种植与干旱控制的先进技术被验证了是行之有效的。
Another important geographic work is Notes on Water Classic, written by Li Daoyuan.
另一本重要的地理学著作是郦道元的《水经注》。

The comprehensive geographic work recorded the hydrology of the Yangtze River area including detailed records of the source, vegetation, relief and networks of 1252 rivers and watercourses with ample illustrations and maps.
这本综合性的地理学书籍记录了扬子江流域的水文地理，其中包含详尽的水源、植被、赈济与1252条河流和水道之间关系的记录并配有丰富的例证与地图。
Ancient watermarks in the form of 14—scaled fish and inscriptions have been found in White Crane Ridge in today’s Chongqing.
以拥有14片鳞片的鱼为图样的古老水位标示和刻印在今天重庆的白鹤桥被发现。
Those records of the hydrology of the Yangtze River accord with the narration in this book.
那些扬子江的水位记录与这本书中所描绘的一致。
Zu Chongzhi (429—500), an outstanding scientist invented a kind of millstone driven by water power.
祖冲之（429——500）是一位杰出的科学家，他发明了一种由水力驱动的磨石。
This mill effectively relieved people of the heavy and inefficient handiwork.
这种磨可以有效地将人们从沉重低效的手工劳动中解放出来。
What makes him known is that he had correctly placed the ratio of the circumference of a circle to its diameter between 3.1415926 and 3.1415927 while the western mathematician didn’t figure it out until several centuries later.
让他闻名于世的一件事是他正确的算出了圆周率的数值为3.1415926到3.1415927之间，而西方的数学家直到7个世纪之后才计算了出来。