Either of two corresponding parallels of celestial latitude that are the limits of the apparent northern and southern passages of the sun.
（天球的）回归线代表太阳经过的最北视界线与最南视界线的两条相应的天球纬线
Her life parallels mine.
她的生活与我相同。
I see parallels between the two cases.
我看这两种情况有相似处.
