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.

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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.

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及时规划和预演成型用原材料也是关键的。

Scheduling and staging material in time is also critical.

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