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| black patch; black smudge; black patches (板、带材上未酸洗或欠酸洗部分的) | |||
| black patches | |||
| black speck | |||
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黑 斑 点 : 5 phrases in 5 subjects |
| Dermatology | 1 |
| Ichthyology | 1 |
| Oil / petroleum | 1 |
| Polygraphy | 1 |
| Technology | 1 |
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