求翻译：园林植物配置是构成园林建筑景观的主题，它不仅起到保持、改善环境，令人心情愉悦等作用，而且还起到美化环境，满足人们游憩的要求。园林建筑绿化时植物配置还应该以生态园林的理论为依据，模拟自然生态环境，利用植物生理、生态指标及园林美学原理，进行植物配置，创造复层结构，保持植物群落在空间、时间上的稳定与持久。是什么意思？

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