To his surprise, he could see nothing but a blank wall of another building.
令他吃惊的是，除了另一幢大楼的一堵空墙，他什么也看不见。
2
That brings me to another variable we need to consider, the acoustic characteristics of the building materials as well as the wall and floor coverings.
那让我想起另一个我们需要考虑的因素，建筑材料的声学特性，以及墙壁和地板的覆盖物。
3
That brings me to another variable we need to consider—the acoustic characteristics of the building materials as well as the wall and floor coverings.