尽管一年中大草原上可能会有大量降雨，但至少有一段时间是降雨很少的，造成干旱压力，最终有利于牧草生长。
Though plenty of rain may fall on savanna during the year, for at least part of the year little does, creating the drought stress ultimately favoring grasses.
干旱的定义是：一段时间内异常的干燥天气。
A drought by definition is a period of unusually dry weather.
他说这干旱的天气可能还要延续一段时间。
He observed that the weather might continue dry for some time.
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