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single hook |
单钩 : 45 phrases in 14 subjects |
Agriculture | 1 |
Automobiles | 1 |
Aviation | 1 |
Communications | 3 |
Economy | 4 |
Finances | 1 |
Fishery fishing industry | 1 |
Hunting | 1 |
International trade | 1 |
Metallurgy | 2 |
Oil / petroleum | 5 |
Project management | 1 |
Rail transport | 1 |
Technology | 22 |