snowpacksCOCA¹²⁷¹⁵⁶ 基本例句 n.水利积雪场原型snowpack的复数 Some of the reasons are natural; California has been in one of its periodic droughts since2006, 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。 ecocn