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1·Large dunes make access to the beach difficult in places.

在有些地方大沙丘使得靠近海滩很难。《柯林斯英汉双解大词典》

2·We walked to the furthermost point and then sat on the sand dunes.

我们走到了最远点，然后坐在沙丘上。《柯林斯英汉双解大词典》

3·The sea may rise or the land may fall; either way the sand dunes will be gone in a short time.

海平面可能会升高，或者陆地可能会下降；不论发生哪种情况，沙丘都将很快消失。《柯林斯英汉双解大词典》

4·Second, as you know, sand dunes contain other types of particles, besides sand, including clay and silt.

第二，正如你所知，除了沙粒，沙丘还含有其他类型的颗粒，包括粘土和淤泥。

5·Now, when the rain fell, water ran down the sides of the dunes, carrying clay and silt particles with it.

如今降雨的时候，雨水会带着黏土和泥沙颗粒从沙丘两边往下流。

6·They're up to a kilometer long, but only a few meters wide, and they're scattered along the desert floor, in valleys between the dunes.

我们所看到的石灰岩层高达一千米，而宽却只有几米，沿着沙漠底部和沙丘间的山谷分布。

7·During the second rainy period, the dunes were kind of chopped up at the top, full of hollows and ridges, and these hollows would've captured the rain right there on the top.

在第二次雨季，沙丘的顶部被砍伐了，到处都是凹洞和山脊，这些凹洞正好在顶部吸收了雨水。

8·The geologic story the Opportunity read there always spoke of an ancient martian wasteland of windblown dunes pocked by the occasional acid-laced puddle.

机遇号对于火星地理结构的解读总是揭示出一个存在于远古火星的，来自于海洋性酸股介水坑的废弃风沙之地。

9·The synsedimentary deformation structures are common in eolian dunes, such as brecciated foresets, drag folds and overturned folds.

风成沙丘普遍存在角砾前积、拖曳褶皱和倒转褶皱等同沉积变形构造。

10·Ribbons of dunes trap the rains.

带状沙丘困住了雨水。

(1)sand dunen. [地]沙丘