年头儿的英文：
(n) a year's duration
(n) many years duration
(n) times; era

year是什么意思：
n. 年；学年，年度；年级学生；年龄；时期；很久；一年时间

Year succeeds to year.
年复一年。

This year is a banner year for crops.
今年是个丰年。

Year after year went past.
一年又一年过去了。

duration是什么意思：
n. 持续时间；期间

The duration of the examination is three hours.
考试时间为三个小时。

The duration of a syllable in quantitative verse.
音节长短在音量的诗歌中某音节的音长

They were incarcerated for the duration of the war.
战争期间，他们被关在狱中。

many是什么意思：
det. 许多，大量；大多数人
pron. 许多；许多人
adj. 许多的

The possibilities are many.
有许多可能。

It has many advertisements and many different sections.
星期日报有很多广告和许多栏目。

There are many, many ramifications and many things we could talk about.
有许多许多的分枝以及我们可以谈论的许多事情。