This focusing is the main reason that even relatively weak sounds in the ocean, especially low-frequency ones, can often travel thousands of miles.
正是由于这种集声，即使是海洋中相对微弱的声音，尤其是低频声音，也能传播数千英里。
The main effect of these additional observations is a 100-point increase in the frequency count for each response alternative.
这些额外调查对象的主要影响是，使得每个回答情形的频率计数增加了 100点。
But some of those precious minutes would be saved by making fewer stops, while train frequency on the traditional west-coast main line will be cut.
但是，这几分钟的宝贵时间将通过减少停靠站的方式节省下来，而传统的西海岸主干线的列车班次会减少。
The main goal of this study was to determine the frequency and degree of recovery or worsening of vestibular function over time.
本研究的主要目的是确定随着时间的推移前庭功能的恢复或恶化频率与程度。
When daily use will cause some wear and tear epoxy floor, so we must use some of the main issues, do not stress, do not use corrosive stuff, all kinds of forklifts, hydraulic car use frequency.
环氧地坪的日常的使用时会造成一些磨损和破坏，所以我们一定主要一些使用事项，不要重压，不要使用带腐蚀性的东西，各种叉车、液压车的使用频率等。
As the listed company finance report is used as the main carrier of its information, its form, contents and frequency of disclosure is the common concerns of theory field and practice field.
上市公司财务报告作为信息的主要载体，其披露形式、内容及频率便成为理论界与实务界共同关注的热点。
Then a new type of structural optimization is proposed by employing one of the main indexes of structural dynamic characters i. e. natural frequency.
在此基础上，引入结构动特性的主要指标之一的结构固有频率，提出了一种新的结构优化形式。
The main analytical method of unsteady flow in pipelines includes frequency domain analysis and time domain analysis.
管道中非稳定流动的分析方法主要有频域法和时域法。
The' main factors resulting in local frequency tracking error are analyzed based on the principles of the tracking local oscillator for frequency agile radars of rotary tuning magnetron type.
本文从旋转变频磁控管式频率捷变雷达的本振频率跟踪原理出发，分析了产生本振频率跟踪误差的主要因素。
The main food affecting physical development of 7~12 month rural children was grain, egg and intake frequency.
影响7~12月儿童体格发育主要食物是谷类、鸡蛋及其摄入频率。
There are two main alternatives, Direct Sequence Spread Spectrum and Frequency Hopping Spread Spectrum.
主要有两种选择，直接序列扩频和跳频扩频。
Sized eight (854), frequency of Scholars, notes Collator, Ren Nanling County main book, has been promoted to martial magistrate.
大中八年（854），频中进士，调校书郎，任南陵县主簿，又升任武功县令。
Automatic governing test of voltage and frequency for main generator (emergency generator).
主发电机(应急发电机)电压、频率自动调节试验。
Main dynamic performance is as follows, frequency response characteristic and steps response characteristic.
主要的动态性能有：频率响应特性和阶跃响应特性。
If the main frequency is near or equal to self vibration of multiplayer construction, the resonate may be occurred, then multiplayer construction will be severity destroyed.
如主频率低到接近或等于多层建筑的自振频率，则有可能发生共振现象，致使多层建筑遭受严重破坏。
Maintenance department: maintenance industries circuit boards, machine equipment system, main board, controller, power supply, frequency converter, PLC and touch screen.
维修部：维修各行业电路板，机加工设备系统，主板，控制器，电源，变频器，PLC触摸屏等。
The paper presents a SPWM frequency variable and velocity variable system with SCR as main switching devices. The proposed scheme has been verified through experiment.
介绍一种以SCR作主开关器件的SPWM控制方式的变频调速系统，并通过实验对提出的方案进行了验证。
Obviously, air pollution is the main factor that has resulted in the frequency of hazy weather.
显然，空气污染是导致雾霾天气经常出现的主要因素。
It is indicated from the process experiment of coin figure that smaller gap and higher surface quality are obtained by choosing higher main pulse frequency.
并根据设计的硬币花纹工艺试验表明，选择较高的主脉冲频率，可获得较小的加工间隙，进而获得良好的表面质量。
Accuracy of the boundary in frequency do, main is first discussed and demonstrated in terms of one dimensional model of wave motion.
首先讨论了频域透射边界的精度，并用一维波动模型详细论证了它的精度和可行性。
The main effect of inflectional instability mode in the final breakdown seems to interact with the disturbances having developed and thus widens the frequency spectrum to turbulent state.
属于拐点不稳定性的高频二次不稳定模态对最后转捩的影响主要体现在与其它扰动的相互作用，并导致出现紊流状态宽带频谱。
It is indicated from the results that effected by the high frequency group pulse power, higher machining quality is obtained by choosing higher main pulse frequency.
结果表明，在高频群脉冲电源作用下，选择较高的主脉冲频率，可获得良好的加工质量。
Then the article analyses the main ingredients: entrepreneurs subrogation frequency, main industrial persistence and industrial diversification which determine the speed of information depreciation.
决定银行私人信息折旧速度的三大因素为：企业家更替频率、主业持续性和经营的多元化。
The application of vapor-liquid reseparator in the main return tube can effectively decrease the frequency of wet stroke and rapidly handle it and thus increase refrigerating efficiency.
采用在回汽总管上设置汽液再分离器，可以有效的减少湿冲程次数并能快速处理湿冲程现象，提高制冷效率。
This frequency range is proximate to main vibration frequency of the traction machine at rated speed, and, according to this, measures against elevator resonance are proposed.
并针对该频率区与曳引机主机额定转速———主振频率接近的特点，提出了防止电梯发生系统共振的措施。
Cut off frequency is the main factor influencing frequency properties of electrode circuits of common emitter, common base and common collector.
截止频率是影响共发射极、共基极和共集电极电路频率特性的重要因素。
Having good time-frequency localization character, and correctly identifying singularity point in fault signal, Wavelet is the main analysis method in this paper.
小波变换具有良好的时频局部性，具有变焦距的特点，对故障信号中的奇异点能够准确识别，是论文中应用的主要分析方法。
Results: The main risk factors are dust and noise which frequency of contact by workers is high.
结果：主要危害因素为粉尘、噪音，职工接害频率高。
Results: The main risk factors are dust and noise which frequency of contact by workers is high.
结果：主要危害因素为粉尘、噪音，职工接害频率高。
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