When cirrostratusclouds are disturbed by planes or strong winds, the droplets can freeze instantly or evaporate, the latter of which will form the hole.
当卷层云受到飞机或强风的干扰时,水滴会立即冻结或蒸发,若为蒸发就会形成孔洞。
2
These clouds occur within cirrostratusclouds, which are often composed of ice crystals and drops of water that are below freezing temperature but still in liquid form.
这些云发生在龙卷云中,龙卷云往往是由低于冰点温度的冰晶和水滴,但仍然保持着液态所组成。
3
These occur in cirrus or cirrostratusclouds, which are often composed of ice crystals and super-cooled water droplets - water that is below freezing temperature, but still in liquid form.