seasonal

季节的；周期性的；依照季节的英释中释adjhappening, expected, or needed during a particular season

1 seasonal variation,季节性波动，季节性变动

2 seasonal affective disorder,季节性情绪失调；季节性情绪波动

3 seasonal adjustment,季节性调整

1 heavy seasonal rains.季节性的大雨