The main forms of green barriers can be concluded as follows: relatively high inquirements on harmful contents in goods, green technical standards, green environment label, green packing and so on.
绿色壁垒的主要形式包括：对商品中的有害物质含量制定较高的指标、绿色技术标准、绿色环境标志和绿色包装等。
The article mainly analyses information resources of library reference in network environment as well as the reference service from aspects of object, way and contents.
文章主要从图书馆参考咨询的信息源到参考咨询的服务对象、服务方式及服务内容等方面作了探析，并对参考咨询馆员的素质提出了更高的要求。
In conventional soil environment quality evaluation, the regional soil background values or the contents in the soil control points of evaluated region were used as evaluation criteria.
以往土壤环境质量评价中，一般是以区域土壤背景值或评价区土壤对照点含量作为评价标准。
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