“三北”是个多义词，它可以指三北（地名）, 三北（释义）, 三北（在保护环境方面）。
关键词: 沙棘,引种,区域化,繁育基地,三北[gap=1792]keywords: seabuckthorn,introduction,regionalization,breeding base,Three North areas
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1978年，中国开始了一项全国性的植树计划，即三北防护林计划，也被称为“绿色长城”。
In 1978, China began a nationwide tree-planting programme known as the Three North Shelterbelt Forest Programme, also known as "the Great Green Wall".
陕西三北防护林体系建设工程是国家在陕实施的六大林业重点工程之一。
Shaanxi Provincial "Three-North Protection Forest System" development was one of the Six Key Forestry Programs in Shaanxi implemented by the State.
据悉，此前潍坊市已成立沿海经济开发办公室，具体组织实施“三北”开发。
It is reported that Weifang has established the coastal economy to develop the office before this, the concrete organization implements "Three Norths" the development.
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