其中有自然原因：2006年以来，加州一直处于一个周期性干旱中，而气候变化是对州内山区积雪的长期威胁。
Some of the reasons are natural; California has been in one of its periodic droughts since 2006, and climate change is a long-term threat to the state's mountain snowpacks.
其中有自然原因：2006年以来，加州一直处于一个周期性干旱中，而气候变化是对州内山区积雪的长期威胁。
Some of the reasons are natural; California has been in one of its periodic droughts since 2006, and climate change is a long-term threat to the state's mountain snowpacks.
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