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| smoothness | |||
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光 滑度 : 16 phrases in 8 subjects |
| Art | 1 |
| Automobiles | 1 |
| Chemistry | 1 |
| Metallurgy | 3 |
| Oil / petroleum | 1 |
| Technology | 7 |
| Telecommunications | 1 |
| Wind Energy | 1 |
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