This paper analyzes the substituting effect of forest certification against tariff barriers using a space-price gradient model, and gives Suggestions.

本文利用空间价格梯度场模型分析了森林认证对关税壁垒的替代效应，并在最后提出了相关建议。

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So using additives properly can obtain the better technical and economic effect in substituting the common cements for the special ones to deal with the troublesome zones.

因而合理使用外加剂可以使常用普通水泥在现场处理复杂地层时代替特种水泥，取得良好的技术、经济效益。

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The objective of the study is to explore the effect of compound Chinese herbal medicinal feud additive substituting antibiotics on boiler meat quality so as to improve the meat quality of broilers.

摘要[目的]探究复方中草药饲料添加剂替代抗生素对肉仔鸡肉品品质的影响，从而提高肉仔鸡的肉质性状。

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