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arena f
soil.	砂土土壤质地分类
tech.	沙粒
arenas v
environ.	沙 (松散的由小的矿物微粒或石头和矿物微粒组成的物质，能用肉眼区分；形状从近球形到有角等形状，直径在1/16到2毫米之间。)

arena: 38 phrases in 14 subjects

Agriculture	4
Botany	3
Construction	3
Environment	4
Fish farming pisciculture	1
Geology	1
Ichthyology	1
International Monetary Fund	1
Knitted goods	1
Pulp and paper industry	1
Soil science	10
Technology	3
United Nations	4
Water resources	1