在水下

Navigation using acoustic range measurement is one of the most important techneques of underwater robot, becoming a research hotspot.

中文摘要基于水声测距的导航定位技术在水下机器人中获得广泛应用，并成为现今水下机器人技术的研究热点。

To begin with, he can quite happily swim below the surface of the water, wearing his equivalent of the aqualung in the shape of an air bubble which he traps beneath his stomach and between his legs, so that he may breathe under water.

首先，水蜘蛛带着一个相当于水肺的东西使其可以在水下自由畅泳。那东西的形状就像一个水泡，水蜘蛛把其藏在自己的腹部及腿下，以便让他可以在水下呼吸。

Underwater color photography was born with this shot of a hogfish, photographed off the Florida Keys in the Gulf of Mexico by Dr. William Longley and National Geographic staff photographer Charles Martin in 1926. Equipped with cameras encased in waterproof housing and pounds of highly explosive magnesium flash powder for underwater illumination, the pair pioneered underwater photography.

意译：海底下的彩色图片诞生在摄影一种猪形之鱼，照片来自佛罗里达的墨西哥海湾，由威廉博士长期和国家的路杂志的摄影师查尔斯·马丁合作于1926年预备防水设备的照相机和高曝光的镁闪光粉保证能够在水下照明，他们成为水下摄影的先驱者。

A part of sliding mass of fording landslide submerges the water level with the operation of reservoir; and the stability factor of landslide has close connection with water pressure of slices below the water level when the transmission coefficient method is used to calculate the stability of landslide.

在水库运营过程中，水库涉水滑坡会有部分滑体没在水下，在采用传力系数法进行滑坡稳定性计算时，滑坡稳定性系数与水下条块的水压力紧密相关。

The construction and the principle of the two-dimensional galvanometric scanner laser scanning system are theoretically described.

对二维振镜激光扫描系统组成和原理进行了理论描述，讨论了在视距范围内采用扩束装置和振镜系统对激光束实施可靠控制的方案，并在水下光通信系统中有效地完成了对水下和空中运动目标所在区域的扫描。

The construction and the principle of the two-dimensional galvanometric scanner laser scanning system are theoretically described. The methods to effectively control the laser beam with bunch expanding devices and the galvanometric scanner system in the visible range and finish the scanning of the area of the goal underwater and in the air in the underwater optical communication system.

对二维振镜激光扫描系统组成和原理进行了理论描述，讨论了在视距范围内采用扩束装置和振镜系统对激光束实施可靠控制的方案，并在水下光通信系统中有效地完成了对水下和空中运动目标所在区域的扫描。

The seedlings of Vallisneria natans were also restrained in the control where underwater light intensity was more than 43.3% of natural light intensity, but the seedlings grew well in the water at turbidity of 30NTU where underwater light intensity was more than 7.1%.

在对照水体中，水下的光强为水面光强的43.3%以上，苦草幼苗也受到抑制；而在水下光强≥7.1%的30NTU水体中，苦草幼苗有较高的光能利用率，幼苗生长较好。

It is shown that the shortcomings of concrete admixed with polyacrylate are basically overcome by substituting polysaccharides for polyacrylate.

而水下不分散混凝土着眼于材料体系本身性质的改善，也就是在尚未硬化状态下即使受到水的冲刷也不能使材料分散，并能在水下形成优质、均匀的混凝土。

Because the underwater operating systems such as the machine drilling shallow stratum core sample in deep sea, the video grab bucket and so on are small and agility, they are capable of exploring and operating in smaller bodies of water in addition to areas of the ocean that would be out of reach for a larger vehicle. Being autonomous requires that the system must be capable of performing without the need for human supervision, so use of external sensors such as sonar are needed to ensure the safety of the vehicle during missions.

由于目前水下操作设备如深海浅地层岩芯取样钻机、电视抓斗等具有体积小、操作灵活等特点，而且要求设备能够在无人操作的前提下工作，因此需要声纳式高度计来保证设备能安全地在水下工作。

The movements of crustal movement to make the land sink, submerged in water, the formation of the continental shelf; sea hit the coast, resulting in wave-cut platforms, submerged underwater, but also the formation of the continental shelf.

地壳的升降运动使陆地下沉，淹没在水下，形成大陆架；海水冲击海岸，产生海蚀平台，淹没在水下，也能形成大陆架。

With Death guitarist Schuldiner adopting vocal duties, the band made a major impact on the scene.

随着死亡的吉他手Schuldiner接受主唱的职务，乐队在现实中树立了重要的影响。

But he could still end up breakfasting on Swiss-government issue muesli because all six are accused of nicking around 45 million pounds they should have paid to FIFA.

不过他最后仍有可能沦为瑞士政府&议事餐桌&上的一道早餐，因为这所有六个人都被指控把本应支付给国际足联的大约4500万英镑骗了个精光。