That is because most of the time sand is not stationary on the beach.
这是因为大多数时候沙子在沙滩上并不是静止的。
Glass, which has been made since the time of the Mesopotamians and Egyptians, is little more than a mixture of sand, soda ash and lime.
自从美索不达米亚和埃及时代以来，玻璃就已经被制造出来了，它只不过是沙子、苏打灰和石灰的混合物。
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。”
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。
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。
She rushed outside in time to see a half-mile wide mud and sand thundering down the hill toward them, knocking over hundreds of trees.
她及时跑了出去，看到半英里宽的泥沙从山上轰隆隆地向他们冲来，撞翻了几百棵树。
The more sand falls, the more time has passed.
落下的沙子越多，流逝的时间就越多。
Sand glasses usually measure a long time.
沙漏测量时间通常很长。
The bar was formed by the mud and sand deposited here over a long period of time.
河里的泥沙淤积在这里，年深日久便成了沙洲。
By the time a grain of sand washes up on a beach in Florida, it has been battered by waves for a long time.
当一粒沙子被冲刷到福罗里达州的沙滩上的时候，她已经被海浪冲刷了很长时间。
For some time she could see nothing before her but a flat waste of sand, which became hotter and hotter as the sun rose higher and higher.
荒凉的沙地一览无余，她找了很长时间却什么也没找到。太阳渐升渐高，天也越来越热。
The oyster dutifully coats the little marble with anouter layer of pearl and much time is saved not having to grow each pearl upfrom the size of a sand grain.
牡蛎会尽职尽忠地为自己腹中的小珠子包裹上一层又一层的珍珠质。 比起那些要从小沙粒开始慢慢成长的珍珠，人工的方法明显会节省很多时间。
If you consider how much sand can be moved in a short period of time by wind, this is a big deal.
如果要说短时间内被风搬运来的沙子有多少，这里就有很多。
Summer is a great time for beach vacations, but try not to spend all your days relaxing in the sand.
夏天是海滩度假的好时光，但是不要耗费你所有的天数在沙滩中放松。
But, having grown up by the ocean, I know that for a certain time after the tide has gone out, the sand is solid from the moisture and is more suitable for running, so I run barefoot there often too.
由于从小在海边长大，我知道在退潮后的某段时间，沙子由于潮湿会变硬，所以我也经常在这个时候在沙滩上赤脚跑。
Brown said Iran was guilty of "serial deception" and it was time for the international community to draw a line in the sand.
布朗说，伊朗有“系列欺骗”的嫌疑，现在是国际社会清楚表明立场的时候了。
Little grains of sand can add up to a mountain over time.
日积月累，要相信细沙也可以堆积成山。
Residual oil buried in sand or sediment may resurface over time.
残余的原油深埋在沙子和沉积物中，它们可能会随时再被冲刷出来。
After a few years building up strength, they swim back to the beaches were they were born to lay up to 150 eggs at a time in holes dug in the sand.
几年过去了，它们的力气增强了，他们便游回了他们的出生地，在那里繁衍下一代，他们一次可以产下150个蛋，然后挖个洞把这些蛋埋在沙子里。
But this time, the construction will be made entirely with sand.
但是这次，该建筑物将全部用沙子建造。
Sunset in Jericoacoara nothern Brasil. Travellers line the giant sand dunes every evening during this time to watch the event.
旅游者每天晚上巨大在巴西北部杰瑞卡的沙丘面前排成一行，来观看那里的夕阳
As the grinding goes on, the pieces get small. Over a long time, tiny grains of sand are made.
在风浪的冲刷下，这些碎粒被磨得越来越小，很久以后就形成了很小的沙粒。
The walls last a surprisingly long time, resisting the lapping tide with the help of energetic patching and fresh buckets of dry sand.
令人惊讶的是，这堵沙墙竟挺立了许久，由于大量修补、新置干沙，竟抵挡住千层浪的攻击。
Once more it took off, this time clearing the sand but heading straight toward a stump.
蜜蜂再一次开始了飞行，不过它是僵直的沿着一条直线走。
Yellow bands—larger, coarse particles—around the Middle East, North Africa, and western North America likely indicate dust and sand storms as the northern hemisphere reaches the driest time of year.
黄色地带，也就是分布着较大的较粗糙粒子的中东地区、北非以及北美西部，随着北半球到达一年中最干旱的季节，很可能预示着有沙尘暴灾害。
Yellow bands—larger, coarse particles—around the Middle East, North Africa, and western North America likely indicate dust and sand storms as the northern hemisphere reaches the driest time of year.
黄色地带，也就是分布着较大的较粗糙粒子的中东地区、北非以及北美西部，随着北半球到达一年中最干旱的季节，很可能预示着有沙尘暴灾害。
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