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The noise voltage, the noise current and their output voltages at the terminal of amplifier are calculated, and the signal to noise ratio of the optic electric conversion circuit is estimated.

分析了频带与噪声电压的关系，计算了光电探测器的噪声电压和噪声电流以及它们在放大器输出端形成的噪声电压，并对光电转换的信噪比进行了计算。

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The noise indicators of ship include radiated noise, self noise, target strength and internal airborne noise.

舰船的噪声指标主要包括辐射噪声指标、自噪声指标、目标强度和舱室空气噪声指标。

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There was a heavy thudding noise against the bedroom door.

卧室门上发出一声沉重的撞击声。

《柯林斯高阶英汉双解学习词典》

Method: Testing F O of lowest true voice, comfortable voice, highest true voice and falsetto voice.

方法: 用电子计算机分别测试真声最低音 、 舒适音 、 真声最高音、假声最高音的FO值.

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He was quiet, conscientious, a bit of a plodder.

他做事闷声不响，小心谨慎，有点死气沉沉的。

《柯林斯高阶英汉双解学习词典》

The child took five steps, and then sat down with a bump.

小孩走了5步，接着扑通一声坐到了地上。

《柯林斯高阶英汉双解学习词典》

She could hear his ragged breathing, as if he had been running.

她能听到他不均匀的呼吸声，似乎他是跑着过来的。

《柯林斯高阶英汉双解学习词典》

There was a loud thump as the horse crashed into the van.

马撞在货车上发出砰的一声巨响。

《柯林斯高阶英汉双解学习词典》

Bistatic sonar will take a significant part in field of future sonar research, as it has advantages as: larger detection range, better hiding ability, flexible range for configuration, anti-interference and mobile ability, etc, when compared with single base sonar system.

双基地声纳与单基地声纳相比，具有探测范围大、隐蔽性好、配置灵活、抗干扰能力强、机动灵活等优点，因此双基地声纳成为未来声纳研究的热点。

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This relatively subjective term produces a sound bank selection with immediate sound output, gradual peak and decline, and a third group with a gradual crescendo.

这个相对主观的术语产生了声音选择库，包含即时声音输出、声音逐渐升高并下降以及第三组渐增的声音。

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From somewhere distant he heard the clatter of a typewriter.

他听见从远处什么地方传来打字机的嗒嗒声。

《柯林斯高阶英汉双解学习词典》

All they heard was the wind whispering through the treetops.

他们听到的只有风吹过树梢的飒飒声。

《柯林斯高阶英汉双解学习词典》

There was a scream of brakes from the carriageway outside.

外面车行道上传来刺耳的刹车声。

《柯林斯高阶英汉双解学习词典》

Sounds are classified into two kinds: sonic and ultrasonic.

声波分为两类, 即 普通声波与超声波.

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The article introduces the features, principles, functions and design of askby sound wave of electrostatic precipitator.

本文介绍了静电除尘器声波清灰的特点, 声波清灰原理 、 声波发生器性能以及静电除尘器声波清灰设计要点.

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As he said it, there was a hammering outside.

他说这话时，外面传来一阵敲打声。

《柯林斯高阶英汉双解学习词典》

As the key testing instrument, the use of Sonar Target Simulation System not only can shorten the research period of sonar greatly, but also play a significant role in sonar production and application.

作为声纳系统的重要测试设备，声纳目标模拟系统的使用不仅可大大缩短声纳的研制周期，而且在声纳的生产、应用等方面都扮演着极其重要的角色。

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And it considered that dynamic modulation makes sound speak and makes sound sound out.

引申的“声音”,并且认为动态调制的目的就是让声音自己说话,让声音发出“声音”.

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He was falsely jovial, with his booming, mirthless laugh.

他低声苦笑了几声，装出快乐的样子。

《柯林斯高阶英汉双解学习词典》

Its principal Branches are architectural, environmental , musical, and engineering acoustics, and ultrasonics.

声学主要分成建筑声学 、 环境声学 、 音乐声学 、 工程声学和超音波.

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In this paper, the properties of universally coupled surface electron, Which is coupled both with SO BO and SA phonons are studied.

本文同时考虑体纵光学声子、表面光学声子以及表面声学声子的影响，研究半无限晶体中与声子普适耦合的表面电子的性质。

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The elevator creaked to a halt at the ground floor.

电梯嘎吱一声停在了一层。

《柯林斯高阶英汉双解学习词典》

"Keep quiet, or they'll all come out," they warned him.

“别作声，否则他们全都出来了，”他们警告他。

《柯林斯高阶英汉双解学习词典》

Ultrasonic cleaning machines is mainly made up of ultrasonic generator and ultrasonic transducer.

超声波清洗机主要由超声波发生器和超声波换能器组成，本文重点介绍超声波发生器。

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Voice-Output Devices Voice-output devices make sounds that resemble human speech but actually are pre-recorded vocalized sounds.

声音输出设备声音输出设备可以发出类似于人类说话的声音,但实际上是事先录制的声音.

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In view of the singing manners , there are single-part song, two-part song , threpocket part song, etc.

从歌唱方法分有单声部 、 二声部 、 三声部等.

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He heard tires squeal as the car braked to avoid a collision.

为避免相撞而刹车时，他听到了轮胎与地面刺耳的摩擦声。

《柯林斯高阶英汉双解学习词典》

This procedure can record mono, stereo, left channel, right channel voice.

本程序可以录制单声道 、 立体声 、 左声道 、 右声道的语音.

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The piano music mixes with the murmur of conversation.

钢琴的弹奏声混杂着低低的交谈声。

《柯林斯高阶英汉双解学习词典》

Yours truly was awoken by a shout: "Ahoy there!"

鄙人被一声大喊惊醒：“喂！”

《柯林斯高阶英汉双解学习词典》