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学科
- Clouds[remove]59
- Trees30
- Mountains24
- National parks & reserves13
- Architectural decorations & ornaments12
- Automobiles12
- Buildings12
- Double-decker buses12
- Finials12
- Monuments & memorials12
- Pedestrians12
- Police12
- Scott monument (edinburgh, scotland)12
- Shadows12
- Street lights12
- Traffic congestion12
- Trucks12
- Shrubs11
- Tree limbs11
- Canyons9