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

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

The classically mesmerizing game of Tetris, for example, keeps skill-challenge levels in balance by increasing the fall speed of blocks as players get better at the game.

例如，经典的俄罗斯方块游戏，通过增加方块的下落速度来平衡玩家水平的提高。

For hailstones that one would typically see in a severe thunderstorm (1-inch to 1.75-inch in diameter), the expected fall speed is between 25 and 40 mph.

直径 1 英寸到 1. 75 英寸） ， 预计下落速度在 25 到 40 英里/ 小时之间。

The fall speed of hail primarily depends on the size of the hailstone, the friction between the hailstone and surrounding air, the local wind conditions (both horizontal and vertical), and the degree of melting of the hailstone.

冰雹的下落速度主要取决于冰雹的大小、 冰雹与周围空气的摩擦力、当地的风力条件（ 水平和垂直） 以及冰雹的融化程度。