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

然后它会像闪闪发光的雹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，石块像雹一样落在我身边。

The largest hailstone ever recorded in the United States was found in July 2010 in Vivian, South Dakota.

2010年7月，美国南达科塔维维安发现了有史以来最大的雹。

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

到离奇，目前发现最大雹大约20cm，重量近1公斤。

How accurate is the recreation of these hailstones?

这些雹的再现有多准确？

Hailstones have been measured up to 20 centimeters in diameter.

据量，雹的直径可达20厘米。

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

因此雹越大，其终端速度越快。

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，便有雹火炭。

Meanwhile, giant hailstones pounded the main camp.

与此同时， 巨大的雹袭击了主营地。

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

刘易斯船长报雹有七英寸那么宽。

Now the coins sounded like hailstones hitting a windshield.

现在硬币听起来就像雹打在挡风玻璃上一样。

But a baseball and the largest hailstone measured deliver more than 80 Joules.

但得的棒球最大的雹可提供超过 80 焦耳的能量。

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

- 这是美国目前世界纪录的雹，是在南达科州维维安发现的。

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

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

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

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

Hailstones then grow by colliding with liquid water drops that freeze onto the hailstone's surface.

雹颗粒随后通过与液态水滴碰撞并将这些水滴冻结在其表面而增长。

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巨型雹的形成。

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

雹颗粒是在雨滴被雷暴上升气流携带到大气中的极冷区域并冻结时形成的。

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

当雹颗粒水平穿过或接近上升气流时， 它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.

此外，雹颗粒也不会因为被抬升到雷暴顶部而生长。