科学家之前认为,雨点在下落过程中彼此碰撞产生了大小不一。但法国研究人员不久前经过研究发现,这一理论有“漏洞”:雨点不可能经常发生碰撞,因为真正的雨点很稀疏。一个雨点自行下落,很可能永远也看不到它的“邻居”。 Scientists have previously thought that raindrops collide with each other as they drop in size. However, a recent study by French researchers found that this theory has “loopholes ”: raindrops are unlikely to collide frequently, because the real raindrops are sparse. A rain drop on its own, it is likely never see its “neighbors.”