季节性流行病的英文：
seasonal epidemics

seasonal是什么意思：
adj. 季节的，季节性的，随季节变化的

season cracking
风干裂缝, 应力腐蚀裂纹, 季裂

shooting season
狩猎期

This is not the season for harvest.
现在不是收获的季节。

The seasons revolve.
季节在周而复始地变换。

In the tropics there are also two seasons: a rainy season and a dry season.
赤道地区一年也只有两季,雨季和旱季。

epidemics是什么意思：
n. 流行病；风尚等的流行
adj. 流行的；传染性的

The corruption had become epidemic.
这种腐化已成为社会上的一种歪风。

Violence is reaching epidemic levels.
暴力达到了流行的程度。

A great epidemic burst forth.
突然发生了一场大瘟疫。

There's an epidemic of serial killings.
连环杀人现象猖獗。

The news of the epidemic struck terror into the population.
流行病蔓延的消息使居民感到恐慌。