一位具有电气工程背景的资深工程师答道，“使用不同的电缆和插头有很多原因。”
A senior engineer with an electrical engineering background replied, "There are many reasons for the different cable and connector types."
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.
例如，当买卖双方就某级别资深工程师的单价达成一致意见时，单价就由买方和卖方事先确定了。
For example, the unit rates are preset by the buyer and seller, when both parties agree on the rates for the category of senior engineers.
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