山区天气变化无常，一小时之内从明媚阳光转为冰雹来袭，迫使登山者匆忙寻找遮蔽处。
The fickle mountain weather turned from bright sunshine to a hailstorm within the hour, forcing the hikers to scramble for shelter.
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解释
fickle 是形容词，意为"变化无常的"，特指天气等自然现象难以预测、迅速变换的特征。
The fickle mountain weather turned from bright sunshine to a hailstorm within the hour, forcing the hikers to scramble for shelter.
fickle 是形容词，意为"变化无常的"，特指天气等自然现象难以预测、迅速变换的特征。