CLIA using acridinium ester derivatives as chemiluminescent label has advantages of low background and high signal-to-noise ratio.

以吖啶酯衍生物为发光标记物的CLIA的特点是：自然本底低和信噪比高。

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This could be because an excess of emissions creates enough background noise to mask the signal for certain predators, said Holopainen.

Holopainen说，这可能是因为过多的排放使背景噪音掩盖了授粉的信号。

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Online monitoring of power system test signal contains a lot of background noise, not easy to detect.

电力系统在线监测中的检测信号含有大量的背景噪声，不便于检测。

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"His engagement would send a very strong signal to people who are wavering" that supporting expanded background checks would be, "if not a safe vote, then not as dangerous a vote as the conventional wisdom might hold, " said Kristin Goss, a professor at Duke University's Sanford School of Public Policy.

WSJ: New GOP Voice in Gun Talks

We turned on a American Idol rerun just for background but it was frustrating to know that CSI was just one ATSC signal away, but we just could not watch it.

ENGADGET: Guide to survive a cable outage HD