声波

The ultrasound is reflected from surfaces within the body in the way that audible sound echoes from a cliff face.

超声波抵达人体内部结构的表面后会被反射，就像声波遇到峭壁会产生回音一样。

C Explain how the vibrations of the cone of the loud speaker produce sound waves in the air and how these waves are transmitted through the air.

声波是纵波。关于上面的图解，画纵波在在扬声器和话筒之间的空气里生产的要描述的波型。

C Explain how the vibrations of the cone of the loud speaker produce sound waves in the air and how these waves are transmitted through the air.

解释扩音器的圆锥的振动怎样在空中生产声波和这些波被通过空气传送怎样。

The minerals of igneous formations were described and a bulk volume model based on mineral and including porosity was established. The logging response equations of density, apparent neutron porosity, acoustic travel time,gamma ray and volume photoelectric cross index were deduced. The volume content of four minerals in matrix was calculated. The igneous rocks were classified according to the international igneous classification scheme proposed by IUGS (International Union of Geological Society).

分析了火成岩中的矿物成分，并基于此建立了以矿物为基础并包含孔隙度的体积模型；建立了密度、视中子孔隙度、声波时差、伽马射线和体积光电吸收截面指数的测井响应方程，计算了岩石骨架中4种矿物的体积含量，依据国际地质科学联合会提出的火成岩矿物分类方案对火成岩进行了分类。

We obtain scattering values of the metal cylinder by utilizing the monostatic system.

我们利用单向系统获得金属圆柱体的声场散射值，即：换能器在远场发射声波照射金属圆柱并且在远场同一地点接收金属圆柱的散射值。

The parameters of pulse combustor such asfrequency,length of feed tube drying tube effecting on drying property were analyzed.It ispropitious to dry high surface-water containing,small granule or liquid materials.

分析了脉动燃烧器频率、热负荷、干燥管长等参数对干燥性能的影响；发现脉动燃烧器尾管内干燥更适合于含表面水高的小颗粒物料或液体物料，可充分利用脉动气流和声波能的作用，使物料分散雾化，增大表面积，提高干燥效率；研究了脉动燃烧器尾管内干燥颗粒物料的传热特性，并将试验结果与其它类型的干燥器进行了比较。

No other bird of prey has these spikes. The leading edge of an eagle's wing is smooth. As the eagle flies, its wings cut through the air creating turbulence .

老鹰的翅膀外缘是平滑的，老鹰飞翔时，双翼在空气中拍动造成乱流，乱流又产生大量的声波形成飞行时的噪音。

Before you can hear the sound, the sound waves must reach your ear.

必须在声波传到你的耳朵之后才能听到声音。

The sound waves do not reach the ear straight on, but through a slightly angled sound front.

这股声波不会径直进入耳朵，而是通过稍微倾斜的声面。

The whole process includes the analysis, design and implementation of the OOFEM for the acoustic characteristics of underwater anechoic coating.

本文通过对比声波在分层介质材料中传播的吸声系数和透射系数的解析解，验证了自编OOFEM软件的准确性。

According to the clear water experiment, aeration performance of the new equipment is good with high total oxygen transfer coefficient and oxygen utilization ratio.

曝气设备的动力效率在叶轮转速为120rpm～150rpm时取得最大值，此时氧利用率和充氧能力也具有较高值。

The environmental stability of that world - including its crushing pressures and icy darkness - means that some of its most famous inhabitants have survived for eons as evolutionary throwbacks, their bodies undergoing little change.

稳定的海底环境─包括能把人压扁的压力和冰冷的黑暗─意谓海底某些最知名的栖居生物已以演化返祖的样态活了万世，形体几无变化。