Meningococcal meningitis occurs in small clusters throughout the world with seasonalvariation and accounts for a variable proportion of epidemic bacterial meningitis.
脑膜炎球菌性脑膜炎在全世界以小型聚集方式出现,存在季节性变化,占流行性细菌性脑膜炎的比例并不固定。
2
There is little seasonalvariation in the incidence of the disease.
在该病的发病率方面存在着极小的季节性差别。
3
The seasonalvariation of phytoplankton zooplankton and nutrients at a fixed station and in the extended Gulf Stream system are studied by using a vertically averaged plankton model respectively.