The tilt of Earth's axis, toward the Sun at some times of the year and away from the Sun at other times, is responsible for the annualcycle of seasons.
地轴的倾斜在一年中的某些时候朝向太阳,而在其它时间远离太阳,造成了每年的季节循环。
2
It can loosely be described as travel that takes place at regular intervals—often in an annualcycle—that may involve many members of a species, and is rewarded only after a long journey.