短语
北方严寒地区
northern cold regions
北方寒冷地区
cold region of the north
;
chill region of china
-
northern cold regions
- 引用次数：1
参考来源 - 北方寒区牛粪无害化处理关键技术研究 Key Technology of Caw Dung Composting Innocuous in Northern Cold Regions
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