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。

youdao

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。

youdao

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。

youdao

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

ECONOMIST: Israel's Greek-island affair

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.

FORBES: To The Horror Of Global Warming Alarmists, Global Cooling Is Here

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

CNN: SHARE THIS