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| 21. | end sill bracket |
| 端梁角补强铁 |
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| 22. | sliding center sill |
| 滑动中梁 |
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| 23. | floating center sill |
| 浮动中梁 |
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| 24. | center sill saddle |
| 梁鞍座 |
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| 25. | center sill stiffener |
| 中梁补强铁 |
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| 26. | threshold | door sill |
| 门槛 |
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| 27. | anti-scour sill |
| 防冲槛 |
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| 28. | engine mud sill |
| 钻机动力机下纵向底梁 |
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| 29. | windshield cross sill |
| 风窗框下横梁 |
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| 30. | center sill splicing |
| 中梁截换|中梁拼接 |
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