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第一手材料 dìyīshǒu cáiliào
agric. first hand materials
busin. first hand material; firsthand data
econ. firsthand material
proj.manag. first hand information
tech. first-hand information; first-hand material
textile first hand data
第一手材料原始材料 dìyīshǒu cáiliào
bridg.constr. first-hand data; firsthand material