| 21. | The railroads and South Platte River served as physical barriers.
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| 22. | Current silicon technology will hit fundamental physical barriers in the next decade or two.
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| 23. | As Mormon crickets are flightless, physical barriers may be effective.
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| 24. | Some of them are divided by a physical barrier or median to enhance safety.
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| 25. | Territories have well-established borders that coincide with physical barriers such as rocks and trees.
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| 26. | In a presentation, breaking down physical barriers between you and your audience is important.
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| 27. | Afghanistan contends that the installation of a physical barrier would make this border permanent.
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| 28. | Hasn't technology made the physical barrier obsolete to border security?
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| 29. | Due to this work, physical barriers to access were identified.
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| 30. | Some of these roads are divided by a physical barrier or median to enhance safety.
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