杜兰用自己最喜欢的研究工具谷歌地图指出，因为农业耕作，就业波动更像是季节性的而非周期性的。
Fluctuations in the job market tend to be seasonal rather than cyclical because of the agricultural calendar, a point that Mr Duran illustrates with his favourite research toy, Google Earth.
有明显的季节性和周期性。
There were obvious seasonal and periodic features in rubella incidence.
由于家用空调行业销售具有明显季节性特点，其经销商管理呈现周期性循环的特点。
Because selling of the home air conditioner trade has the obvious seasonal characteristic, its distributor management presents periodic return.
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