“field observation of frozen soil depth”的概念、定义、翻译、参考文献-科学参考

单词	field observation of frozen soil depth
释义	field observation of frozen soil depth Encyclopedia 农学农田冻土深度观测释 field observation of frozen soil depth农田冻土深度观测对农田土壤冻结时间、冻结层次及其上、下限深度与冻结程度的观察与测量活动。
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