n a late time of life
n a prolonged period of time
n the time during which someone's life continues
n a period of time containing 365 (or 366) days
n a period of time occupying a regular part of a calendar year that is used for some particular activity
n the period of time that it takes for a planet (as, e.g., Earth or Mars) to make a complete revolution around the sun
n a body of students who graduate together
n. 年代；岁月；年；年龄