These droplets are suspended in a vertical wind tunnel.

这些水滴悬浮在一个垂直的风洞。

Droplets suspended in a vertical wind tunnel are experiencing the same net forces as falling raindrops.

悬浮在垂直风洞中的水滴正在经历与下落雨滴相同的净力。

However, recent research outside of NSSL using 3-D printed casts of real hailstones suspended in a vertical wind tunnel has repeatedly shown that natural hailstones fall more slowly than solid ice spheres.

然而， 最近在 NSSL 之外的研究使用 3D 打印的真实冰雹模型悬浮在垂直风洞中， 一再表明天然冰雹比固体冰球下落更慢。