查询词典 sand dune

The total microbial numbers in fixed sand were 2.8 and 12.5 times as many as those in semi-fixed sand and in sand-flowing dune,respectively.

土壤微生物，在风沙土的发生、土壤肥力的形成和发展、营养元素的转化中起着不可替代的作用[1]。

Sedimentary facies model for mixed sediments of recent reefoid carbonates and siliciclastics is developed from the facies model of fringing and barrier reefs. Based on the sedimentary facies and textures, mixed sediments may be subdivided into 5 types as follows: 1 reef base mixed sedimentary rocks and reef framework mixed sedimentary rocks; 2 reef flat sand-gravel mixed sedimentary rocks; 3 backreef beach-dune gravel-sand mixed sediments; 4 backreef lagoonal sand mixed sediments ; and 5 reef front littoral sand mixed sediments.

礁源与陆源混合沉积相模式是从岸礁一堡礁相模式基础上发展而来，根据其沉积相和沉积结构特徵可以分为5种混合沉积：①礁基混积岩和礁格架混积岩；②礁坪砂砾屑混积岩；③礁后海滩－沙提砾砂屑混合沉积；④礁后泻湖砂屑混合沉积；⑤礁前浅海砂屑混合沉积。

The decreased threshold shear velocity and unsaturated sand flows at the stoss slope of the dunes resulted the erosion at the toe of the dune. Under the medium and low drifting-sand winds the sands being transported have divergence with that on the surface, the mean grain size of transported sands is lower than that on the surface and the sand transporting is a stochastic process.

起动剪切速度减小与不饱和风沙流是沙物质在横向沙丘迎风坡坡脚不能产生沉积的主要原因；再者，平均风速并不能完全反映野外实际状态下气流的性质，在低－中强度的风沙活动过程中，被输送的沙物质的粒度组成与下垫面物质有明显的差异。

The field experiments on the secondary flow developed on the lee side show that there are strong sand transport potential at the lee side of the dunes near the surface because of the decreasing of the sand grain size and the other factors. The transport directions are nearly vertical to the dune trends. Those factors and the sand slumping on slip face, and the sand transport processes on the stoss slope make the transverse dunes maintaining their morphology under the advance processes.

对沙丘背风坡发育的二次流的野外观测表明，近地面一定高度内沙丘背风坡气流仍有一定的强度，由于背风坡的沙丘沙粒径较小等因素，背风坡气流仍保持一定强度的输沙率，输沙方向与沙丘走向基本上垂直，这种作用与沙物质向背风坡崩落、迎风坡的输沙过程等共同作用，因而使横向沙丘在运动中保持其形态。

The field experiments on the near surface airflow, sand transport rate, grain size of the dune sands and the morphology of the dunes show that though shear velocity decreased at the toe of the transverse dune, the threshold shear velocity decreased simultaneously. The decreased threshold shear velocity and unsaturated sand flows at the stoss slope of the dunes resulted the erosion at the toe of the dune.

对简单横向沙丘表面的气流、输沙率、物质结构，以及形态学特征的观测表明，在横向沙丘迎风坡坡脚尽管剪切速度有所下降，但起动剪切速度同时减小，起动剪切速度减小与不饱和风沙流是沙物质在迎风坡坡脚不能产生沉积的主要原因。

Blond children scoot around on bicycles, elderly German couples take their evening constitutionals along the waterfront and teenagers who look surprisingly like California surfer dudes guide tourists through an utterly un-African extreme sports scene: sand boarding, sand sledding, sand skiing and sand sailing — none of which includes a dune lift, so all of which demand repeated uphill slogs through the sand and the inhalation of lungfuls of Namibian dust.

白肤金发的儿童在自行车兜圈，年长的德国夫妇沿着江边消磨自己晚上的时光，看起来像加利福尼亚的花花公子的青少年们在引导游人体验这种绝对的并非－非洲人的极限运动场景：沙滩木板、沙滩雪橇、沙滩滑雪术和沙滩航行术。所有的运动无不被沙丘弹到空中，所以所有的运动要求穿过沙土艰难的向上行进，两肺都将吸入大量的纳米比亚的尘土。

Blond children scoot around on bicycles, elderly German couples take their evening constitutionals along the waterfront and teenagers who look surprisingly like Californiasurfer dudes guide tourists through an utterly un-African extreme sports scene: sand boarding, sand sledding, sand skiing and sand sailing - none of which includes a dune lift, so all of which demand repeated uphill slogs through the sand and the inhalation of lungfuls of Namibian dust.

金发的孩子们骑着自行车飞驰而过、中年的德国夫妇沿着码头散步，像极了打扮的很花哨的加州冲浪运动员的青年们引领着游客们穿过完全没有一点非洲风格的极限运动场：沙滩冲浪，沙滩雪橇，沙滩滑雪和沙滩航行---每一个项目都离不开沙丘，而且所有的项目都会让你一次又一次地吸入纳米比亚的沙尘。

Blond children scoot around on bicycles, elderly German couples take their evening constitutionals along the waterfront and teenagers who look surprisingly like Californiasurfer dudes guide tourists through an utterly un-African extreme sports scene: sand boarding, sand sledding, sand skiing and sand sailing - none of which includes a dune lift, so all of which demand repeated uphill slogs through the sand and the inhalation of lungfuls of Namibian dust.

白肤金发的孩子们疾速地骑着自行车到处跑，年龄大一点的德国情侣们在河边度过一个又一个花前月下，那些十几岁的年轻人，看起来不可思议地像极了加利福尼亚人，他们则承担起东部旅行者们的导游，带领他们参看那些完全脱离了非洲格调的极限运动：滑沙板、滑沙橇、沙地滑雪、沙飘—这些运动中没有任何一个使用沙丘攀登设备，因而它们所要求的是在沙地上的反复攀爬跋涉并吸入满肺的纳米比亚尘土。

This study provided the analysis of changes of species diversity and productivity in relation to soil properties in six typical habitats （wet meadow, dry grassland, fixed dune, semi-fixed dune, semi-shifted dune, and shifted dune） in Horqin Sand Land.

研究了科尔沁沙地6个典型生境类型的沙质草地群落物种多样性与生产力的变化，分析了植物群落格局、物种多样性、生产力与土壤特性的关系。

To make sure of the characteristics of Landform in Aer sand-fixation area, a related investigation was conducted , the results shows that Aer sand-fixation area can be divided into five kinds of landforms , namely wandering dune , semi-wandering dune , fixed dune , wind-erosion flatting area and Low-Lying interspaces between mountains .

调查结果表明，彰武县阿尔乡围封沙地按地貌特征可分为五种地貌类型：即流动沙丘、半流动沙丘、固定沙丘、风蚀洼平地和丘间低地。

Methods: Five patients with parkinsonism or dystonia were assigned to general anesthesia using an modified endotracheal tube.

本实验依照人体实验之相关规定进行，五位患有帕金森氏症或肌张力异常的病人接受神经立体定位手术。

If you can benefit from this book, it is our honour.

如果您能从本书获益，这将是我们的荣幸。