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| little-studied (mermaid_22); underinvestigated (bix); under-investigated (bix); less studied (the work casts light on some of the less studied aspects of the life and atmosphere Maria Klavdieva) | |||
| insufficiently explored; insufficiently studied | |||
| poorly studied; poorly explored | |||
| understudied (Andrey Truhachev) | |||
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малоизученный : 7 phrases in 5 subjects |
| General | 3 |
| Geology | 1 |
| Medical | 1 |
| Space | 1 |
| Transport | 1 |