For different individual horseshoe crabs, the circadian period ranged from 22.2 to 25.5 hours.

对于不同的鲎来说，其生理节奏的周期范围在22.2小时到25.5小时之间。

youdao

It usually happens in the first few hours of sleep in the period called deep sleep.

它通常发生在睡眠的最初几个小时，这个阶段被称为深度睡眠阶段。

youdao

They were visited during February to May 2007 and samples were taken after a waiting period of two hours after cleaning and disinfection.

在2007年5月份到他们那里，并且在清洁和消毒后的两小时进行取样。

youdao

"The Lost Symbol" takes place in Washington,D.C., over a period of just twelve hours.

VOA: special.2009.10.09

So it's important to be here on time and stay throughout 3 hours' period.

一定不能迟到,每节课3个小时，不能早退。

麻省理工公开课 - 电影哲学课程节选

Instead,slow earthquakes release their energy over a period of hours or even days.

VOA: special.2009.07.07

Because of his health problems, which include emphysema, Macgillivray was alleged to have carried out the attack over a period of hours.

BBC: Life sentence for murderer who has five years to live

At the risk of tasking you with my infantile fantasies, I was, for a period of hours, John Wayne or Robert Mitchum or James Stewart.

WSJ: Roger Ebert on Elizabeth Taylor

He said once the reduced hours period was over in April, they would review how much money it had saved.

BBC: March over Malton minor injuries unit opening hours