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| 21. | epitaxial ledge |
| 外延台阶 |
|
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| | |
| 22. | stepped gear whee |
| 台阶齿轮 |
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| 23. | shoulder of hole |
| 井眼台阶 |
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| | |
| 24. | ascend the steps |
| 登上台阶 |
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| | |
| 25. | orchestral riser |
| 乐团台阶 |
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| | |
| 26. | step cutting pattern |
| 台阶图形 |
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| | |
| 27. | standing of solid construction |
| 实心台阶 |
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| | |
| 28. | pickup shoulder |
| 提升台阶 |
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| | |
| 29. | to offer a chance to extricate oneself from an awkward positio |
| 找台阶 |
|
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| | |
| 30. | calibration step |
| 校准台阶 |
|
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| | |