远古时代，人们就开始修筑简陋的房舍、道路、桥梁和沟澶，以满足简单的生活和生产需要。
Ancient times, people began to build simple houses, roads, Bridges and ditch Chan, to meet the simple life and production needs.
远古时代，人们就开始修筑简陋的房舍、道路、桥梁和沟澶，以满足简单的生活和生产需要。
In ancient times, people began to build simple houses, roads, Bridges and still water channel to meet the simple life and production.
远古时代，人们就开始修筑简陋的房舍、道路、桥梁和沟澶，以满足简单的生活和生产需要。
In ancient times, people began to build simple houses, roads, Bridges and still water channel to meet the simple life and production.
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