technology provided to improve soil and grasslands, develop barren mountainous regions and make full use of natural conditions;
改进泥土、草地，开辟荒山，以及富裕利用天然资源的技巧；
technology provided to improve soil and grasslands, develop barren mountainous regions and make full use of natural conditions;
改进泥土、草地，开辟荒山，以及富裕利用天然资源的技巧；
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