These would then fall down to the base of the mantle like sparkly hailstones.

然后它会像闪闪发光的一样落到地幔的底部。

In a few minutes, rocks were falling like hailstones around them and around us.

几分钟内，石块像一样落和我身边。

And speaking of bizarre, the largest hailstone ever found measured in at roughly 20 cm, weighing almost 1 kg.

说到离奇，目前发现最大大约20cm，重量近1公斤。

How accurate is the recreation of these hailstones?

这些的再现有多准确？

Hailstones have been measured up to 20 centimeters in diameter.

据测量，的直径可达20厘米。

So the bigger the hailstone, the faster its terminal velocity.

因此越大，其终端速度越快。

Meanwhile, giant hailstones pounded the main camp.

与此同时， 大的袭击了主营地。

So this is the United States and current world record hailstone that was found in Vivian, South Dakota.

- 这是美国和目前世界纪录的，是南达科州维维安发现的。

Captain Lewis reported that the hailstones were as wide as seven inches.

刘易斯船长报告说有七英寸那么宽。

Out of the brightness of his presence clouds advanced, with hailstones and bolts of lightning.

因面前的光辉，的厚云行过，便有炭。

The conditions experienced by the hailstone can change as it passes horizontally across or near an updraft.

当水平穿过或靠近上升气流时， 所经历的条件会发生变化。

Hailstones also do not grow from being lofted to the top of the thunderstorm.

也不会从被放出到雷暴顶部而增长。

The layers, however, do not occur simply due to the hailstone going through up and down cycles inside a thunderstorm.

然而，层的形成并不仅仅是因为雷暴中经历上下循环。

A laser thunder factory could shake the moisture out of clouds, perhaps preventing the formation of the giant hailstones that threaten crops.

激光雷工厂可以抖落云层中的水分，或许可以防止威胁农作物的型的形成。

Early research assumed that hailstones fell like solid ice spheres and showed very high fall speeds, even for very small hailstones.

早期研究假设像固体球一样下落， 并且显示出非常高的下落速度， 即使对于非常小的也是如此。

Hailstones can have layers of clear and cloudy ice if the hailstone encounters different temperature and liquid water content conditions in the thunderstorm.

如果雷雨中遇到不同的温度和液态水含量条件， 可以有一层层清晰和浑浊的。

However, it is possible for very large hailstones (diameters exceeding 4-inches) to fall at over 100 mph.

但是， 非常大的（ 直径超过 4 英寸） 可能会以超过 100 mph 的速度落下。

Hailstones are formed when raindrops are carried upward by thunderstorm updrafts into extremely cold areas of the atmosphere and freeze.

当雨滴被雷暴上升气流带到大气中极冷的区域并冻结时， 就会形成。

And if the supply of water vapor is much larger, the energy released can produce stratosphere-high pillars of cloud with violent updrafts, fierce electrical storms, and grapefruit-sized hailstones.

如果水蒸气的供给足够多，所释放的能量就可以形成平流层高度的云柱，伴随着猛烈的上升气流，造成猛烈的雷暴，下起葡萄柚大小的。

Smaller hailstones can be blown away from the updraft by horizontal winds, so larger hail typically falls closer to the updraft than smaller hail.

水平风可以将较小的从上升气流中吹走，因此较大的通常比较小的更靠近上升气流。