发作季节主要为冬季及季节更替时。
The attack seasons were mostly in winter and during seasonal variation.
结果：本病与情绪紧张、剧烈活动、吸烟、饮酒及季节变换等有密切关系。
Results:This disease was closely correlated with emotional strain, strenuous exercise, smoking, drinking and the convertion of season.
研究了不同立地条件下落叶松树冠各个方向的净光合速率、呼吸速率、日进程及季节进程。
Diurnal and seasonal processes of net photosynthetic rate and respiration rate of directions of crown of Larch at different site conditions were studied.
应用推荐