系统不能精确地匹配输入和输出的情况。电子放大器就是一个非常普通的例子，另外还有家庭立体声音响放大器。
The inability of a system to exactly match input and output, a general example being an electronic amplifier and the classic example being a home stereophonic amplifier.
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.
这是非常简单的音响系统，转盘，放大器-和扬声器-一成不变的。
It is very simply a hi-fi system - with turntable, amplifier, and speakers - cast in concrete.
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