虽然大多数城市看起来是随性规划的,但一些千年古城是经过了设计的。 虽然大多数城市看上去是偶然成型的,但数千年来,他们当中的一些是经过规划的。
Although most cities seem to form by accident, for thousands of years some of them have been designed.
设计了基于RP数据库的快速成型工艺规划系统。
The RP's process planning system based on RP database is designed.
及时规划和预演成型用原材料也是关键的。
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