The mechanism of the produce of target noise, its transmission characteristics in air and several main factors that influence the sound transmission are analyzed.

分析了低空目标声源的产生机理、目标辐射噪声在大气中的传播特性以及影响其传播的几个主要因素。

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The system of passive ranging SONAR makes use of the target noise received by the equipment which converts energy from one form to another to estimate the target distance.

被动测距声纳系统是利用换能器基阵接收的目标辐射（噪声）信号来估计目标距离。

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The US did begin to engage, but only to make more noise in the negotiations, dampening hopes for a US emissions reduction target.

美国确实开始参与行动了，但是他们只不过在谈判中引起更大的喧哗，因而降低了人们对美国提出减排目标的希望。

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Building social impact campaigns that reach target audiences in the sea of online noise generated by Facebook and Twitter can be daunting.

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Nokia have made noise with new smartphone models that will target the entry level smartphone market, particularly in the emerging markets.

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