如果对它们的数量进行时间记录，就会发现它是很不稳定的——以不规则的周期急剧上升下降。

If their population is tracked through time, it will be seen to be particularly unstable—soaring and plummeting in irregular cycles.

youdao

路易斯安那大学拉斐特分校的天文学家约翰·马泰塞和丹尼尔·惠特迈尔曾多次发表声明表示，基于长周期彗星运行轨道的不规则性，他们发现了该天体存在的证据。

Astronomers John Matese and Daniel Whitmire of the University of Louisiana at Lafayette repeatedly claimed to have evidence of its existence based on irregularities among long-period comets.

youdao

那些症状包括高黄体生成素和睾酮水平、不规则的生殖周期和排卵减少。

Those symptoms included high LH and testosterone levels, irregular reproductive cycles, and fewer ovulations.

youdao