周しゅう期き

Usage patterns

• 〈数かず〉の周しゅう期きでin cycles of (a given interval)

  この現げん象しょうは約やく十じゅう一いち年ねんの周しゅう期きで起おこる。

  This phenomenon occurs in cycles of about eleven years.

• 周しゅう期きを持もつto have a (regular) period/cycle

  地ち球きゅうは約やく二に十じゅう四よ時じ間かんの周しゅう期きを持もつ。

  The Earth has a cycle of about twenty-four hours.

• 周しゅう期きが乱みだれるfor a cycle/rhythm to become irregular

  生せい活かつが不ふ規き則そくになって、月げっ経けいの周しゅう期きが乱みだれた。

  Her lifestyle became irregular, and her menstrual cycle got thrown off.