31. These walls were more soundproof then conventional walls, and stopped excessive noise between classrooms. 32. How can I soundproof that wall? 33. A medium-size, neatly dressed man of 67, he sat behind soundproof glass. 34. Hospital executives fear they will have to build new soundproof rooms to comply with those rules. 35. After that, they were required to work through a soundproof window from an adjoining room. 36. This will help save heating and cooling costs, and will make the walls more soundproof . 37. About 100 interpreters in soundproof booths in a stadium next-door simultaneously translated his words. 38. For instance, researchers will use a soundproof room to study the sounds made by butterflies. 39. The restroom was placed off-limits during tapings as a result of not being soundproof . 40. It was written in gratitude to the school which had built a soundproof studio for him.
