求翻译：第二，经济合理性原则，应考虑保留有利用价值的资源，如造型优美的植物、维护较好的驳岸、长势较好的片林等，且在植物配置时充分利用现有树种或地方性树种，少用名贵树种和外来引种。是什么意思？

Second, the principle of economic rationality, should be considered to retain the use of valuable resources, such as the elegant plant, maintain good revetment growing good woodlots, and make full use of existing species or endemic plant configuration species, with less use of valuable tree species

The first 2 principles, economic rationality should be taken into account, and keep the resources in use a value, such as landscape plants, and maintaining a better connection with better cross-strait, flowers are blooming, such as forest, and in the plant configuration, taking full advantage of exi

Second, the economical rational principle, should consider the retention has the use value resources, like modelling exquisite plant, maintenance good waterfront construction, growing trend good piece forest and so on, also when plant disposition the full use existing tree seed or the local tree see

Secondly, the principle of economic rationality, should consider retaining the use of valuable resources, such as beautiful growth of plants, maintain a good bulkhead, better forest, and plant configuration to take full advantage of existing species or endemic species, the rare tree species and exot

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