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.

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。

youdao

So the climate is warm and moist.

为温暖湿润气候。

youdao

It's warm and moist there and sunny.

那里温暖潮湿而且阳光充足。

youdao

Vanilla comes from orchid plants growing in South America and other places with warm, moist weather.

VOA: special.2010.06.01

The sheets keep the soil moist and warm, and also stop weeds growing.

ECONOMIST: Genetic technology supports sustainable farming