The primary period of normals is 32 days and its subperiod is 17 days.
多年平均值的主周期为32天，次周期为17天。
It also discusses the cultural methodology of teaching foreigners Chinese in the primary period in line with the integral language cultural teaching background.
并结合整个语言文化教学的大背景，讨论了对外汉语教学初级阶段的文化教学方法。
As to natural gas processing industry, the development of advanced controlling program and simulation model was in the primary period.
我国天然气加工工业采用先进的控制方案和先进的模拟模型尚在起步开发之中。
Primary period, for the sake of safety, the school rarely arrange extracurricular activities.
小学生时期，为了安全着想，学校极少安排课外活动。
Primary period, for the sake of safety, the school rarely arrange extracurricular activities.
小学生时期，为了安全着想，学校极少安排课外活动。
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