annual variation 年变化 ; 年变 ; 年际变化 ; 年变动
magnetic annual variation [地物] 磁周年差 ; 磁年差
geomagnetic annual variation [地物] 地磁年变化
annual variation of pressure 气压的年变化
lunar annual variation 月球年变化
semi-annual variation 电离层半年变化
annual magnetic variation 周年磁变 ; 年磁变 ; 磁周年差 ; [地物] 年磁差
Both intra-annual and inter-annual variation of runoff in the catchment has been analyzed in the paper.
径流时间序列分析主要从径流的年内分配和年际变化分析了和田流域河川径流的变化特征。
参考来源 - 和田河流域径流过程分析与模拟The prevailing wind direction is north-east in summer and south in winter. Annual variation of wind speed is significant,in April the largest and the smallest in January.
风向有明显的年变化,夏季多为东北风,冬季多为西南风;风速的年变化明显,4月最大,1月最小。
参考来源 - 敦煌戈壁地区近地层风的变化特征·2,447,543篇论文数据，部分数据来源于NoteExpress
The scientists observed the redstarts in their non-breeding territories for five years during the dry season. They paid special attention to the annual variation in dry season rainfall.
科学家们在旱季对这些在非繁殖地的红尾鸲观察了5年，同时又特别观察了旱季降雨的年际变化。
The basic current has the annual variation under the influences of solar radiation, earth's surface temperature and condensation heatings, all with an annual period.
其次，在具有年周期的太阳辐射、垫面温度及凝结加热的作用下，基本气流以年周期变化。
There is obviously annual variation in the summer temperature in NanChang, and the mean summer temperature has decrease tendency.
南昌夏季平均气温存在明显的年际变化特征，夏季平均气温有下降的趋势；
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