There were certain drawbacks in the three ways of gathering, which had many negative effects on the ecological environment and the society of the time.
这三种采木形式都有一定的弊病，这使皇木采办对当时的生态环境和社会都产生了很大的消极影响。
Ecological products have the characteristics of profit outflowing. Financial means can be adopted to solve the problem of external effects of ecological environment.
生态环境产品具有利益外溢的特点，财政手段可以有效解决生态环境外部效应问题。
Objective To investigate the effects of ecological environment changes on fasciolopsiasis epidemic in Weishan lake area after the South-to-North water diversion.
目的研究南水北调后微山湖生态环境改变对姜片虫病流行的影响。
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