现今中纬度正在变暖，覆雪几乎完全消失。
Today the midlatitudes are warming up and the snow cover has mostly disappeared.
在一个活动周期开始的时候，就可以找到高速气流，像中纬度地区的太阳黑子。
At the beginning of a cycle the jet stream is found, like sunspots, in mid-latitudes.
在一个活动周期开始的时候，就可以找到高速气流，像中纬度地区的太阳黑子。
At the beginning of a cycle the jet stream is found, like sunspots, in mid-latitudes.
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