如果埃皮格是正确的，在那些国家通过接种疫苗，清洁水源和妥善的污水处理使得多种传染疾病几近绝迹，这即使不能全部至少也可以部分解释弗林效应。
If Mr Eppig is right, the near-abolition of serious infections in these countries, by vaccination, clean water and proper sewerage, may explain much if not all of the Flynn effect.
文章阐述了水源涵养林对水土保持、涵养和净化水资源等的效能；
The paper summarized the main benefits of water conservation forest such as soil and water conservation, water purification.
论述了水源涵养林的生态效益及其计量方法和模型；
The estimating methods and models, the benefit compensation principles were discussed also.
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