city cluster的用法和樣例：
例句
- Howerver the current development of the PRD city clusters is far from being a strategic platform for the national wealth accumulation.
但目前珠三角城市群的發展遠未形成國家財富積聚的戰略平台。 - The functions of the industry clusters in thedevelopment of city groups include the drive mecha-nism and restriction mechanism.
產業集群在城市群發展中的作用機制有驅動機制和約束機制。
