(noun.) the period of time that it takes for a planet (as, e.g., Earth or Mars) to make a complete revolution around the sun; 'a Martian year takes 687 of our days'.
(noun.) a period of time containing 365 (or 366) days; 'she is 4 years old'; 'in the year 1920'.
(noun.) a period of time occupying a regular part of a calendar year that is used for some particular activity; 'a school year'.
校对:韦恩
编辑:莉齐