| 21. | An " acoustic waveguide " is a physical structure for guiding sound waves.
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| 22. | The physical structure of deerskin leather is different than other types of skins.
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| 23. | The physical structure of these institutions are themselves oppressive, resembling prisons in many ways.
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| 24. | There have been noteworthy improvements to the physical structure in the past few years.
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| 25. | The connection between physical structure and psychology has not been proven by scientific studies.
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| 26. | Damage to the physical structures at Clark Field was immense.
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| 27. | Structure refers to the physical structure of the bottom of the ocean along shore.
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| 28. | The latter attempts to mimic how physical structures emerge in biology through gene expression.
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| 29. | So there will be a need for physical structure determination.
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| 30. | The physical structure of the helicopter is similar to that of the Super Puma.
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