| 11. | In both cases, treatment provides a physical barrier to flame spread.
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| 12. | Physical barriers to gene flow are usually, but not always, natural.
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| 13. | These are just the physical barriers to going back to school, Banks said.
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| 14. | It's not only a physical barrier that's there; it becomes invisible.
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| 15. | Actual physical barriers guarded the gates to every training facility during the walkout.
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| 16. | Physical barriers of seedlings are also used in some of the European countries.
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| 17. | Intercropping should include physical barriers, for citronella roots can take over the field.
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| 18. | Many Asian Americans also face physical barriers to health care access.
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| 19. | He did not give any details of what physical barriers would be created.
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| 20. | Some sections are along the Shenzhen River thus acting as a physical barrier.
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