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| symmetrical ripple mark | |||
| compound ripple; oscillation ripple; symmetrical ripple | |||
| para-ripple; symmetric ripple marks; symmetrical ripple marks | |||
| 对称波痕: 12 phrases in 6 subjects |
| Desert science | 1 |
| Earth sciences | 1 |
| General | 1 |
| Geology | 1 |
| Oil / petroleum | 2 |
| Technology | 6 |
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