“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.
每逢农历三月初三北帝诞，这里都会聚集荔湾各乡的人士，举行规模盛大的庙会活动。
On the 3rd day of the 3rd month on the Chinese calendar, a grand temple fair was held here to celebrate the birthday of Emperor Zhenwu.
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