持续暴露在噪声环境中 Exposure to sustained noise
典型的咳嗽会持续约四分之一秒，包括刺耳的吸气，安静的呼气，然后是形成咳嗽噪声的复杂爆裂声。
Coughs typically last around one-quarter of a second, comprising a sharp intake of breath, a silent exhalation and then the complex burst of sounds that makes the cough noise.
为何不试试这种方案能否操作其自身的加密函数呢，即便数据是被加密过的，进而消除足够的噪声以使整个流程持续运转？
Why not see if the scheme could handle its own decryption function, even while keeping the data secret, to remove enough noise to let the whole process continue?
经过几个月的观测之后，他注意到一个来自人马座方向的无法识别，但一直持续不断的噪声源。
After months of observations, he noticed that one unidentified yet persistent source of noise was coming from the direction of the constellation Sagittarius.
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