Definition

Examples

• 这种疾病的发作具有周期性。
  Zhè zhǒng jíbìng de fāzuò jùyǒu zhōu qī xìng.
  The onset of this disease has periodicity.
• 经济学家研究经济危机的周期性。
  Jīngjì xuéjiā yánjiū jīngjì wēijī de zhōu qī xìng.
  Economists study the periodicity of economic crises.
• 潮汐的周期性是由月球引力引起的。
  Cháoxī de zhōu qī xìng shì yóu yuèqiú yǐnlì yǐnqǐ de.
  The periodicity of tides is caused by the moon's gravity.