listener echo loudness rating 收话人回音响度额定值
Listener echo in telephone networks 电话网中的受话回声
The sound heard by a listener when holding a seashell to his ear does not come from the shell itself. It is the echo of the blood pulsing in the listener's own ear.
将一只贝壳贴近耳朵，这时听到的声音不是贝壳本身发出的，而是听者自己耳朵中血流脉搏的回声。
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