题目内容
_____may be embedded or obscured by massive cloud layers.
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In the cumulus stage, a lifting action initiates the ________ movement of air.
Precipitation creates a _______ motion in the surrounding air.
______ thunderstorms generally form in a warm, moist airmass and are associated with or scattered over a large area.
Airmass thunderstorms are most common during ________ .
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