sea·son·al·ly /ˈsiːzənəli/ adverbadv according to what is usual for a particular season 季节性地,随季节地 bird migrations that occur seasonally 鸟类的季节性迁徙
seasonally adjusted figures/rates/data etc (=ones that are changed according to what usually happens at a particular time of year) 随季节调整的数字/比率/数据等