systems以及声音环境acoustically harsh rooms，它们决定了在阿卡贝拉比赛中配备一个混音工程师是非常关键的。
A. systems, and acoustically harsh rooms make it essential to have a mixing engineer with acappella experience.
这位资深工程师所知道的就是两个音响部件之间的连接，两段铜线和一些绝缘介质之间的接收器、混音器、放大器和扬声器。
What the senior engineer knew was the connection between two sound components — such as receiver, mixer, amplifier, and speakers — went beyond two copper wires and some insulation.
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