你正在和一个人谈话，但是信号和噪音的比率低，也就是说，对方的声音(信号)，相对于周围的谈话声(噪音)是安静的。
You're in conversation with one person but the signal to noise ratio is low, meaning his voice, the signal, is quiet relative to the ambient conversational noise.
如果一个老硬盘有噪声，你可以整理一下硬盘碎片，看声音是否减少，也可以买一个新的、安静的硬盘。
If an old hard drive is making noise you can either de-fragment it and see if that reduces the sound, or you can buy a new, silent hard drive.
她安静地坐了一会儿，随即又注意到了另一个声音。
She sat in silence for a while, and then she noticed another sound.
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