Life is an endless cycle of repeat and renewal, deducting or adding the parts that are mature and in need.

生活就是重复与更新的不断循环，减去到期的部分，增加需要的部分。

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The fifth chapter puts forword renewal strategies of old residential areas with the theoretic instructions of Healthy City, which includes two parts of spacial planning and neighbourhood planning.

第五章在健康城市对于居住区的理论指导下提出旧居住区的更新整治对策，主要分为空间规划和邻里规划两个方面。

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Currently, machine parts parametrized CAD systems are available in the market. Some of them may be powerful but they are enormous in volume, high in price, and awaiting renewal of computer technique.

现有机械零件参数化CAD系统，有的功能虽然较强，但系统过于庞大，价格高昂，且有待于更新计算机技术。

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