In late spring , when a hive gets too crowded , a colony normally splits , and the queen , some drones , and about half the workers fly a short distance to cluster on a tree branch 晚春时分，一个蜂巢总是会非常拥挤，通常情况下蜂群就会分裂；蜂后、雄蜂与几乎一半的工蜂便会短距离地分行并簇拥于一个树枝。
In the periods of peak zooplankton abundance ， that is ， in the late spring and in the summer ， haney recorded maximum daily community grazing rates ， for nutrient - poor lakes and bog lakes ， respectively ， of 6 . 6 percent and 114 percent of daily phytoplankton production 在浮游生物数量高峰期，也就是晚春和夏季的时候，汉尼分别在营养匮乏的湖泊和沼泽做了纪录，发现浮游生物每日的群体觅食量是每日浮游植物产量的6 . 6 %和114 % 。
The precipitation and evaporation data at 12 observational stations from 1958 to 2003 were used to calculate the spring drought index , the criterion of spring drought and the spring drought index series were set up , the spatial and temporal features , yearly and decadal climate variability of the indexes of the loess plateau in gansu province were analyzed 摘要利用甘肃省甘肃黄土高原地区12个代表站1958 ~ 2003年春季3 ~ 5月逐候降水、蒸发资料，建立了该地区早春旱和晚春旱指数序列，确定了春旱等级标准，进一步分析了春旱的时空分布特征及其年际（年代际）变化规律。
The results showed the drought index could successively and dynamically monitor the drought process , so it was the better representative ; the frequency of spring drought of the loess plateau area in gansu was stronger in north than in south and its center is in gansu center ; the frequency of serious late spring drought was increasing while that of early spring drought was decreasing 结果表明： ( 1 )干旱指数能够连续动态地监测干旱过程，因而具有较好的代表性； ( 2 )甘肃黄土高原地区早春旱和晚春旱北部高于南部，干旱中心在陇中； ( 3 )重晚（早）春旱的发生频率增加（减少） ，站数增多（减少） ； ( 4 )区域性早春旱随年代呈下降趋势，区域性晚春旱略有上升的趋势，但不明显。
