专家认为，此次流感的流行周期将持续到明年3月份。
Health experts maintain that the flu will last till next March.
自1992年以来疟疾发病率已连续10年被控制在1／万以下，并消除了流行周期。
Since 1992, the incidence of malaria has been less than 1/10 000, and the epidemic period disappeared.
中国古代马球运动兴衰演变的过程，典型地体现出时尚流行的“常态曲线”规律，构成了一个完整的流行周期；
The ups and downs of polo in ancient China is a typical display of the regular pattern of "normal curve" popularizing nowadays, and has formed a whole period of popularity.
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