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| 皮肤损伤; 外皮损伤 | |||
| 井壁损害; 趋肤效应损害 | |||
| 表皮堵塞; 井壁不完善; 井壁堵塞; 井壁污染 | |||
| skin damage: 3 phrases in 2 subjects |
| Drilling | 1 |
| Oil / petroleum | 2 |
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