大气干旱(atmosphere drought)
空气过度干燥,相对湿度过低,使植物的蒸腾作用过强,根系吸水补偿不了失水,使植物体发生水分亏缺的现象。
A campus emergency ______ occur at any time of the day or night, weekend, or holiday, with little or no warning.
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