1.
We were married almost fifty years.
我们结婚将近五十年。
2.
Our fiftieth reunion?
是我们的五十年重聚？
3.
The two steps together will take 50 or 70 years.
两步加起来，正好五十年至七十年。
4.
That is, for the first 50 years it cannot be changed, and for the second there will be no need to change it.
前五十年是不能变，五十年之后是不需要变。
5.
In the agreement we stated that no change would be made for 50 years, and we mean it.
我们在协议中说五十年不变，就是五十年不变。
6.
The decade from50to59in a century.
五十年代在一个世纪中从50年到59年的十年
7.
Fifty years of China′s sulphuric acid industry-celebrating the 50th anniversary of the founding of the Peoples′s Republic of China and the 40th anniversary of the initiation of Sulphuric Acid Industry;
中国硫酸工业五十年——纪念建国五十周年暨《硫酸工业》创刊四十周年
8.
15. Within seven years, build according to specified requirements the different kinds of roads (highways, roads and paths) needed in the provinces, prefectures, counties, districts and townships.
(十五)在七年内，将
9.
September and December 1955
（一九五五年九月、十二月）
10.
On December twenty-fifth every year.
每年的十二月二十五日。
11.
IN CELEBRATION OF THE TWENTY-FIFTH ANNIVERSARY OF THE OCTOBER REVOLUTION
祝十月革命二十五周年
12.
Forty is the old age of youth, fifty is the youth of old age.
四十是青年的老年，五十是老年的青年。
13.
November 1951--March 1952
(一九五一年十一月——一九五二年三月)
14.
Three five-year plans cover a period of fifteen years.
三个五年计划就是十五年。
15.
Last month he was sentenced to 5-15 years in prison.
上个月他被判处五年至十五年徒刑。
16.
My diaries cover twenty-five years.
我写日记长达二十五年。
17.
Except once, about 15 years ago...
有一次例外，在十五年前……
18.
the 10th Five-Year Plan period
第十个五年计划期间