在水下的

Supported by the National Natural Science Foundation, this dissertation mainly deals with bionics study on Thunniform swimmer, theoretical kinematics modeling and computer simulations, analyzes effects of elastic elements on propulsion efficiency, and experimentally studies a new type of underwater propulsor.

本文以国家自然科学基金项目"仿鱼鳍水下推进器的理论与实验研究"为背景，集中对鲹科加新月形尾鳍推进模式鱼类游动的仿生学研究、仿鱼水下推进器运动学建模与仿真、弹性组织在提高推进效率中的应用、及其相关的新型仿鱼水下推进器等方面进行理论与实验研究。

Aimed at the use of underwater active detection system, an analog pretreatment circuit is designed. More than one amplifier and two filters are used to process the signal. The signal can be amplified and self-excitation is avoided. The series of AD867X are used to restrain the circuit noise.

针对水下主动探测系统的应用，设计了一种模拟预处理机，该电路采用分级放大结构，并使用两级滤波器对信号进行滤波处理，在达到对信号放大倍数要求的同时避免了放大器自激，采用噪声性能好的AD867X系列芯片有效抑制了电路噪声对信号的影响。

On this planet. The activities of internal waves appear as hidden trouble for offshore structure safety, background noise in the underwater acoustic channels and a ''stirrer'' for abyssal mixing.

内波活动是海洋结构的安全隐患、水下声道的背景噪声源和深水混合的&搅拌器&，我们考察了内波在海洋工程、海洋环境和水声探测中的各种应用。

Any of several submerged plants of the genus Ceratophyllum, forming branched masses in quiet water and having finely dissected, whorled leaves and minute unisexual flowers.

角苔一种金鱼藻属的水下植物，在风平浪静时会形成纵横交错的树枝网，生有轮生的多裂叶，开极小的单性花

Lead on to the defect in pile body of bored caisson pile, mainly relate to wall mud, boring drill rate, 3 materials of concrete, water cement ratio and mixing quality controlled by concrete under water when pouring, self defect of pouring conduit, and operation way heighten conduit, and so forth.

导致钻孔灌注桩桩身缺陷，主要与护壁泥浆、成孔钻速、组成砼的三大材料、在灌注时水下砼控制的水灰比及搅拌质量、灌注导管的自身缺陷、以及提升导管的操作方式等有关，根据一些工程实例，分析了形成桩身缺陷的具体原因，并提出了防范措施。

The results show that the mud flats is obviously wave characteristics in plane, the erosion variation from low tidal flats to the top of the slope under water is great in cross section, the relative stable tide currents and wave strength keep the mud flats stableness in dynamic, and the key of the flat er...

本区岸滩纵向上由东向西存在着明显的波状变化特征，在横向冲淤变幅上以低潮滩至水下斜坡上部最为明显；相对稳定的沿岸潮流和波浪作用强度是岸滩稳定的动力保证，沿岸泥沙供应量的变化则是局部岸滩冲淤变化的关键所在。

The underwater ecosystem study called "Life Beneath the Platforms" has shown the abundance of unique species of marine life such as hawksbill turtles and colourful fish species flourishing under the BSP's oil rigs.

称为&平台下的生命&水下生态系统研究已经探测到大量珍稀的海洋生物物种，如活跃在汶莱蚬标石油公司钻井下的玳瑁海龟和五颜六色的热带鱼。

But the relatively low-energy muons produced in the atmosphere can travel only a few kilometres. So by building neutrino arrays like ANTARES and IceCube deep under water or ice, astronomers can make sure that most of the muons they detect were actually produced by cosmic neutrinos.

在大气层中产生的能量较低的μ介子穿梭距离只有几公里，也就是说，制造类似&心宿二&和&冰块&这样深埋水下或冰层下的中微子望远镜阵列，能够确定探测到的绝大多数μ介子是否由宇宙中微子产生。

Using conformal mapping, the longitudinal protrusion height and the lateral protrusion height on the V-grooved surfaces are given, on this basis, some drag reducing features in parallel-flow, cross-flow and enlarge- flow are presented and analyzed; In addition, drag reducing features with blade-shaped grooves and U-shaped grooves are discussed, consequently, the riblets designing criterions are suggested which will reduce the drag and noise most effectively underwater.

3利用保角变换方法求出V—型条纹的纵向和横向突出高度，在此基础上得出纵向流、横向流和带角度流动时的降阻特性，并分析结果；而且分析了叶片型条纹和U—型条纹表面上的降阻情况，提出水下具有最佳降阻效果的条纹表面设计准则。

Studies of the Weddell seal in the laboratory have described the physiological mechanisms that allow the seals to cope with the extreme oxygen deprivation that occurs during its longest dives, which can extend 500 meters below the ocean's surface and last for over 70 minutes.

对威德儿海狮研究形容它的身体机制能使他很好的应付由于长期潜水而出现极度的缺氧情况，使他能够潜到水下500米，并待70分钟以上提示：这个句子有三个定语从句，修饰什么很容易判断，都是形容从句前的内容，只是在翻译时要注意一下组织方式。

Singer Leona Lewis and former Led Zeppelin guitarist Jimmy Page emerged as the bus transformed into a grass-covered carnival float, and the pair combined for a rendition of "Whole Lotta Love".

歌手leona刘易斯和前率领的飞艇的吉他手吉米页出现巴士转化为基层所涵盖的嘉年华花车，和一双合并为一移交&整个lotta爱&。

This is Kate, and that's Erin.

这是凯特，那个是爱朗。