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astronomical
>
powder avalanche
降在背风斜坡的雪不像山脚下的雪那样堆积紧实,这叫
粉雪崩
。在斜坡背后会形成缝隙缺口。它给人的感觉是很硬实和安全,但最细微的干扰或者像一声来复枪响的动静,就能使雪片发生崩落。