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| 英国政府 | |||
| 倒挡; 倒挡齿轮装置 | |||
| 倒档传动; 倒档 | |||
| 倒挡齿轮 | |||
| 倒档齿轮 | |||
| 背【倒档】齿轮; 跨轮 | |||
| 背〔齿〕轮; 背〔跨，后倒，慢盘齿〕轮 | |||
| 背齿轮; 后倒齿轮 | |||
| 减速齿轮; 后齿轮; 背轮; 慢盘减速齿轮 | |||
| 反齿轮 | |||
| back gear: 12 phrases in 3 subjects |
| Metallurgy | 2 |
| Technology | 9 |
| Textile industry | 1 |
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