... perforated cadmium layer 有齿孔的镉表层 periods of rain 部分时间有雨 persistent rain 持续有雨 ...
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There were actually two periods of rain and lake formation: the first one began about 37,000 years ago; and the second one dates from about 10,000 years ago.
事实上，这里有两个时期的降雨和湖泊形成：第一个始于大约37000年前；而第二个可以追溯到约一万年前。
It brings longer droughts between more intense periods of rain.
干旱期会越来越长，而与其交叉的降水期则更加密集。
This higher rate seems to make wet regions more sodden, and arid ones drier. It brings longer droughts between more intense periods of rain.
这样会使潮湿地区更加沥涝，乾燥地区更加枯旱，容易造成豪雨成灾和久旱不雨的极端现象轮番上阵。
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