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| 有效表面 (积); 有用表面 (积); 有效表面积; 有用表面积 | |||
| 可用表面; 有效表面 | |||
| 海的自由表面 | |||
| available surface: 7 phrases in 3 subjects |
| Agriculture | 1 |
| Engineering geology | 1 |
| Technology | 5 |
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