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学科
- Mountains[remove]3
- Shrubs3
- Channels2
- Golden gate bridge (san francisco, calif.)2
- Suspension bridges2
- Trees2
- Automobiles1
- Bays (bodies of water)1
- Buildings1
- Clouds1
- Fences1
- Hills1
- Index peak (wyo.)1
- Passengers1
- Pilot peak (wyo.)1
- Red lodge (mont.)1
- San francisco bay (calif.)1
- Utility poles1
- Walls1
- Yellowstone national park1