| 1. | The main physical obstacle is air-conditioning the school buildings.
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| 2. | But both political and physical obstacles had to be overcome.
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| 3. | At Great Falls, the Potomac presented physical obstacles to travel as well.
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| 4. | The space may have varying elevation and physical obstacles.
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| 5. | This is not only a physical obstacle, but a mental obstacle as well.
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| 6. | On TV, producers heighten the reality, adding physical obstacles or psychological pressures.
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| 7. | And then there are the physical obstacles.
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| 8. | Besides the physical obstacles, there are mental obstacles to overcome when battling an injury.
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| 9. | The third factor was the construction of the separation wall, a physical obstacle to terror.
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| 10. | The French, attacking resolutely, carried the Russian position in the face of considerable physical obstacles.
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