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。

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There are two hardships in the primary period of Chinese modernization.

二是现代文明的精神文化明显滞后。

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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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But he also allegedly provided each of them with logistical help in primary-election campaigns in this period.

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The 20 to 30 year ocean temperature cycles turned back to warm from the late 1970s until the late 1990s, which is the primary reason that global temperatures warmed during this period.

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It also suggests that the removal process has been going on during a "90-day quiet period" prior to the August 14 primary election.

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