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大约数量
| 级
| 大约 数量 | |
| avia. | approximate quantity |
| B3 级 | |
| IT | B3 class |
| 级 | |
| gen. | grade; rank |
| econ. | hierarchy |
| hydroel.st. | stage |
| interntl.trade. | Aaa |
| met. | cascade; class; step |
| |||
| approximate quantity | |||
|
大约数量 : 4 phrases in 2 subjects |
| Aviation | 2 |
| Commerce | 2 |
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