The result indicates that the discharge per unit width, the sediment concentration, the grain size of sand influences the depth of scour hole.
试验结果表明：浑水水流的单宽流量大小、含沙量的多少以及含沙粒径的变化都对冲刷坑深度有一定的影响。
As these rise, they latch on to dust in the air and become particulates, a quarter the size of a grain of sand.
上升过程中，这些元素附着在空气中的尘埃上，变成微粒，大小相当于一粒砂子的四分之一。
“Sometimes more than a thousand, ” he wrote, “in anamount of material the size of a grain of sand.”
他写道，“有时一粒沙子大小的样本中就有超过一千的微生物。”
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。
Far more worrying are several radioactive chemicals released as particles about one-quarter the size of a grain of sand. These include iodine-131, strontium-90 and cesium-137.
更令人担忧的是一些释放出的颗粒状放射性化学物质，这些颗粒仅仅是沙粒大小的四分之一，它们包括碘- 131、锶- 90和铯- 137。
"We can make sensors the size of a grain of sand or smaller, but we don't have a good way to power those sensors, " for months or even years, said Collins.
科林斯还说，数月甚至数年来“我们就能够制作出甚至比盐粒还小的传感器，但是我们没有好方法来给他们提供动力。”
Each microdot is the size of a grain of sand and contains an identifier.
每颗微粒都是一粒沙粒的大小并且包含一个辨识码。
By analysis of sand grain size in sediment microenvironment of modern rivers, the size and shape of grain and surface texture feature of quartz grain were described in this paper.
本文根据现代河流的已知沉积微环境中的砂样分析，阐述了河北平原河流沉积物的粒度成分、形态和石英颗粒的表面结构特征。
The feature include grain size feature, surface feature of quartz sand. geochemistry feature and so on.
所讨论的特征包括黄土颗粒的大小，石英颗粒表面特征，以及地球化学意义，等等。
The effect of the grain size distribution of quartz sand, dolomite and limestone on mixing homogeneity of glass batch was investigated.
研究了砂岩、白云石、石灰石的粒度分布的变化对玻璃配合料混合均匀性的影响。
Let's try a comparison: Reduce the sun to the size of a golf ball. The earth would be the size of a grain of sand.
我们来打个比方。假如把太阳缩小到高尔夫球那么大，那幺地球的大小就会象一粒沙子。
Most of the meteors are about the size of a grain of sand, but some can be as large as a silver dollar.
大部分流星只有沙粒大小，但有一些可以大到象一块银元。
It can collect the pressure and the flow by da (data acquisition) system during testing, also can sample and analysis the grain size of the flow after controlled sand.
使用数据采集系统实时采集试验过程中的压力、流量数据，同时对筛管防砂后的流体采样，并进行粒度分析。
Lets try a comparison: Reduce the sun to the size of a golf ball, the earth would be the size of a grain of sand.
我们来打个比方。假如把太阳缩小到高尔夫球那么大，那么地球的大小就会象一粒沙子。
Test results show:for the same grain size groups the flow velocity relating incipient motion of these granite sand grains decreases as the bed slope increases;
实验结果表明，同一粒径组的非粘性花岗岩风化砂粒随底坡坡度的增加其起动流速变小；
Test results show:for the same grain size groups the flow velocity relating incipient motion of these granite sand grains decreases as the bed slope increases;
实验结果表明，同一粒径组的非粘性花岗岩风化砂粒随底坡坡度的增加其起动流速变小；
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