岩溶洞穴沉积物形成于湿暖、干冷交替的环境；
They formed in the environments of humid warm and dry cold climate in turns.
形成龙卷风，寒冷的空气必须处在暖湿的空气上部，而风应该在不同高度向不同的方向运动，以此创造出剪切力。
To form a tornado, cold air must sit above warm and moist air, and the wind needs to go in different directions at different heights, creating shear forces.
这恰恰是正在格陵兰岛上发生的事情，格陵兰岛上相对暖而湿的冰盾正处于完全融化的进程中，这将导致海平面可能升高七米的前景。
Yet that is just what is happening in Greenland, whose relatively warm and wet sheet is on course to melt completely, bringing the prospect of a sea-level rise of perhaps seven metres.
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