英文：下雨的过程（60词以上）

In waterclouds, cloud droplets are small drops. They are mostly from continue condensation and colliding compounded lattar. Therefore, in waterclouds, cloud droplets will increase to the size of the rain, we first need to cloud is very thick, cloud droplets dense, moisture content many, so that it can continue to condense growth; Secondly, in the waterclouds inside still need to have strong vertical movement, like this can increase many collisions compounded opportunities. While in thinner and more stable waterclouds, cloud droplets not enough condensation and compounded growth opportunities, can cause cloudy, cloudy day, the general assembly does not rain.
In different parts of a cloud, the cloud droplets size within the distribution is different, causing cloud droplets uneven size of the reason for this is that the transfer of moisture in the air around which cloud droplets of evaporation and. That cloud droplets growth factor is congeals and collision and process, in only condensation role, under the situation of cloud droplets size is uniform, but because of the added to make some water vapor cloud droplets increased, plus and and function of the results, the larger cloud droplets continue to grow bigger be rain. Raindrops suffer the effect of gravity and decline, when there are updraft, you will have a upward force is applied in the rain, make its declining speed slowing, and a few small rain may also be brought up. Only when raindrops increases to a certain extent, to fall to the ground, into rain.