The smallest cloud droplets start out as these spheres.

最小的云滴从这些球体开始。

More importantly, a cloud droplet cannot form without an aerosol particle seed.

更重要的是，若是没有气溶胶颗粒的种子 云滴是无法形成的。

Exhaust increases the number of tiny particles in the air, on which water vapor condenses to form cloud droplets.

废气使空气中微粒的数量增加，而水蒸气则在微粒上凝结成云滴。

Dust particles also influence the growth of cloud droplets and ice crystals, thus affecting the amount and location of precipitation.

尘埃颗粒还影响云滴和冰晶的生长， 从而影响降水的量和位置。

The droplets are 20 times smaller across than a human  hair, 10 times smaller than Earth's cloud droplets, and far smaller than rain.

这些水滴的直径比人的头发细 20 倍，比地球上的云滴小 10 倍， 比雨水小得多。

We find them in fissures of rock miles beneath our feet, in boiling waters of the ocean floor, in acidic waters of thermal springs, and in cloud droplets miles above our heads.

在我们脚下的岩缝里，海底岩床的沸水中，地热温泉的酸性泉水中，我们头顶几英里上方滴落的雨水中。