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| 转向器蜗杆-齿扇式 | |||
| 蜗杆与扇形轮; 扇形蜗轮蜗杆 | |||
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worm -and-sector : 7 phrases in 3 subjects |
| Agriculture | 1 |
| Automobiles | 2 |
| Technology | 4 |
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