year

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year的基本意思是“年”,指地球绕太阳一周所需要的时间,通常为365天,有时也为366天,也可指与某物有关的“一年的时间”。year也可指一个人的“年龄,年岁”,还可指“学年,年度”。
year表示“…岁的”时,其后通常要加old一词,此时year前后都须有连字符,且不可用复数形式。
years在表示“好几年”时,前面一般不加many。如果指几十年,甚至更长的时间,则不能用years。
year of之后往往不搭用年份的数目,除非前面有定语。

A year is a period of twelve months or 365 or 366 days, beginning on the first of January and ending on the thirty-first of December.
&rarrsee also leap year
A year is any period of twelve months. 1
Year is used to refer to the age of a person. For example, if someone or something is twenty years old or twenty years of age, they have lived or existed for twenty years.
A school year or academic year is the period of time in each twelve months when schools or colleges are open and students are studying there. The school year starts in August or September.
A financial or business year is an exact period of twelve months which businesses or institutions use as a basis for organizing their finances.
You can use years to emphasize that you are referring to a long time.
&rarrsee also calendar year , fiscal year
the period of time, the solar year, during which the earth makes one revolution around the sun, measured between two successive vernal equinoxes: equal to 365.24219 days (Also called astronomical year, tropical year)
the period of time, the sidereal year, during which the earth makes one revolution around the sun, measured between two successive conjunctions of a particular distant star: equal to 365.25636 days
If something happens year after year, it happens regularly every year.
If something changes year by year, it changes gradually each year.
If you say something happens all year round or all the year round, it happens continually throughout the year.