在水下的

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。

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。

Usually just their big nostrils appeared for a gulp of air as they foraged on sea grasses or swam slowly to greener underwater pastures.

通常，当它们在水下寻找海草或者慢慢地游向一些更绿的水下牧草场时，它们长长的鼻孔会伸出水面来换气。

The results show that the flow units consist of type A, B, C and D which distribute in sedimentary microfacies of subaqueous distributary channel, mouth bar, crevasse splay, interdistributary bay and subaqueous natural levee, respectively.

研究表明，本区的河流相储层可以划分为为A、B、C、D 4类流动单元，分别分布在水下分流河道、河口坝、决口扇、分流间湾和水下天然堤微相中。

Photo Gallery: Underwater Scenes Photographer Emory Kristof has pushed the boundaries of underwater photography over his long career, from pioneering the invention of remotely operated vehicles, high intensity lighting, and robot cameras, to exploring wrecks like the Titanic and shooting deep sea creatures like these fish and floating salps in the Bowie Seamount.

意译：水下景色图片美术馆。摄影师埃默里克里斯托夫已经推进水下摄影的界线在他的长期生涯上，从开拓型发明的远程地操作交通车，高强度光源，和机器人照相机，去探测沉船像泰坦尼克号和深海摄影生物像这些鱼和浮动的樽海鞘在鲍伊海底山。

Photographer Emory Kristof has pushed the boundaries of underwater photography over his long career, from pioneering the invention of remotely operated vehicles, high intensity lighting, and robot cameras, to exploring wrecks like the Titanic and shooting deep sea creatures like these fish and floating salps in the Bowie Seamount.

意译：水下景色图片美术馆。摄影师埃默里克里斯托夫已经推进水下摄影的界线在他的长期生涯上，从开拓型发明的远程地操作交通车，高强度光源，和机器人照相机，去探测沉船像泰坦尼克号和深海摄影生物像这些鱼和浮动的樽海鞘在鲍伊海底山。

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。