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periodic block method
forestr.	定期作业分区法

periodic : 66 phrases in 19 subjects

Accounting	4
Animal husbandry	4
Astronomy	6
Business	1
Chemistry	20
Demography	1
Finances	1
Forestry	4
Geography	2
Information technology	5
International trade	2
Literature	2
Nuclear physics	2
Oceanography & oceanology	4
Sociology	1
Statistics	2
Television	1
Textile industry	3
United Nations	1