Are you still corresponding with your parents?
你一直在和你父母通信吗?
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
A unit of time corresponding approximately to one cycle of the moon's phases, or about30 days or4 weeks.
月大约和月亮盈亏的一个周期相当的时间单位, 或约三十天或四周