Every analogue wireless system has background noise to a certain extent.

每个模拟无线系统都有一定程度的电子干扰音.

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To break through that background noise and mind clutter, a marketing message has to be interesting.

要突破这些杂讯以干扰, 行销诉求就一定得有趣.

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Conventional hearing devices amplify everything - from conversations to background noise to the clock ticking.

一般的助听器会放大所有的声音 — 言语声、景噪声和钟声等.

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