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| 拱〔穹，顶,背斜〕翼 | |||
| 拱翼; 顶翼; 穹翼 | |||
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| 拱翼 (roof) | |||
| 穹翼; 拱翼; 倒转褶皱上翼; 伏卧褶皱上翼; 背斜翼; 顶翼 | |||
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arch-limb : 3 phrases in 1 subject |
| Oil / petroleum | 3 |
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