It lays its eggs in shallow depressions in the sand with very little protection around them.
它把蛋产在沙中的浅洼地里，周围几乎没有保护措施。
Long-ago builders could have attached wooden poles to the stones and rolled them across the sand.
很久以前，建筑工人可以在石头上绑上木杆，然后让它们在沙子上滚动。
Until just recently, most of us thought the sand had come from an ancient mountain range fairly close by that flattened out over time.
直到最近，我们大多数人都以为这些沙子来自附近的一个古老山脉，它随着时间的推移逐渐变得平坦。
Two geologists discovered that about half of the sand from the Grand Canyon was actually once part of the Appalachian Mountains.
两位地质学家发现，约半数的来自大峡谷的沙子实际上曾经是阿巴拉契亚山脉的一部分。
A few weeks ago, I found the marks of another man's feet on the sand.
几个星期前，我在沙滩上发现了另一个人的脚印。
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。
Those tears are your body's way of getting the sand or dirt out of your eye.
这些眼泪是你的身体把沙子或灰尘从眼睛里清除出去的方式。
Wendy, look at the turtles burying their eggs in the sand.
温迪，你看那些把蛋埋在沙子里的乌龟。
In other cases, the finer particles may be removed, while the sand-sized particles are accumulated to form mobile hills or ridges of sand.
在其他情况下，较细的颗粒可能被除去，而沙粒大小的颗粒堆积起来形成移动的山丘或沙脊。
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。
As she pulls the shoes out, the box with the sandwiches in it breaks open and the ham, the cheese, and the bread slices fall into the sand.
当她把鞋子拿出来的时候，装着三明治的盒子打开了，火腿、奶酪和面包片都掉在了沙子里。
Diatoms of this species, sometimes called "commuter" diatoms, remain burrowed in the sand during high tide, and emerge on the sand surface during the daytime low tide.
这种硅藻，有时被称为“通勤硅藻”，在涨潮时留在沙土中，在白天退潮时出现在沙土表面。
Buffington says he found a soda bottle half buried in the sand that looked like it had been there since the beginning of time.
布芬顿说，他发现了一个半埋在沙子里的汽水瓶，看起来好像从一开始它就在那里。
Buffington says he found a soda bottle half buried in the sand that "looked like it had been there since the beginning of time."
布芬顿说，他发现了一个半埋在沙子里的汽水瓶，“看起来就像是从一开始就在那里一样。”
Just before the sand is inundated by the rising tide, the diatoms burrow again.
就在沙子被涨潮淹没之前，硅藻再次钻入。
Joe sat poking up the sand with a stick and looking very gloomy.
乔坐在那儿用棍子捅沙子，一副愁眉苦脸的样子。
In order to withstand tidal currents, juvenile horseshoe crabs frequently burrow in the sand.
为了抵御潮汐，幼年马蹄蟹经常在沙子里挖洞。
Its long eyelashes keep out the sand during sandstorms.
它长长的睫毛可以在沙尘暴来袭时挡住沙子。
The sand falls from the top of the sand glasses to the bottom.
沙子从沙漏的顶部落到底部。
He hurriedly covered his head with the clothes, prostrate on the sand.
他连忙用衣服盖住头，俯卧在沙滩上。
When the sand has finished falling, you have to turn the sand glasses over.
当沙子落完的时候，你必须把沙漏翻过来。
Still, shortly after sunrise on Saturday, Jack was on the beach digging in the sand.
尽管如此，周六日出后不久，杰克就在沙滩上挖沙子了。
We should make a sign about not throwing rubbish into the sea, and put it in the sand on the beach.
我们应该制作一条不要把垃圾扔进海里的标语，并把它立在沙滩上。
In the sand states—Florida, Arizona, Nevada and California—these trends went into overdrive in the years leading up to the crisis.
在沙州——佛罗里达、亚利桑那、内华达和加利福尼亚——这些趋势在危机爆发前的几年里发展到了极致。
The invasion of the sand crabs!
沙滩蟹的入侵！
The child packed the sand down with his shovel.
小孩用铲子将泥沙压紧。
The caption reads, "As the sand advances, we retreat."
标题写着：“沙进我退”。
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