1.
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。
2.
Survey of Chinese Rural Novels in the First Half of the 20th Century;
二十世纪前五十年中国农村小说概述
3.
Julius Caesar subdued Gaul in 50 B.C.
凯撒在公元前五十年时征服高卢。
4.
So, we should think not in terms of just three to five years, but in terms of the last 20 years of this century and the first 50 of the next.
所以，改革不只是看三年五年，而是要看二十年，要看下世纪的前五十年。
5.
Except once, about 15 years ago...
有一次例外，在十五年前……
6.
The temple was built about 555 BC.
这所寺院约建于公元前五百五十年。
7.
Preface to the new edition of Fifty Years in Dunhuang
《九十春秋——敦煌五十年》新版前言
8.
Avoid dictionaries that are more than ten or at most fifteen years old.
最好不用十年前或至多十五年前出版的字典。
9.
"In the first decade, we will accomplish all the objectives set in the Tenth Five-Year Plan and for the years up to nest year."
前十年要全面完成"十五"计划和明年的奋斗目标。
10.
The date of the agm have been advanced to may 10th.
年度股东大会的日期提前到五月十日。
11.
The Queen was enthroned more than 50 years ago.
女王是五十多年前即位的。
12.
The solar system was formed 4.5 billion years ago.
太阳系是四十五亿年前形成的。
13.
Fifty years ago, the bowl game was a different ball game.
五十年前，保龄球运动跟现在完全不同。
14.
Almost nobody had a cellphone.
也是在十五年前，几乎没有人有手机。
15.
Fifty years ago, most of the countries in Asia were colonies.
五十年前，亚洲大部分地区都是殖民地。
16.
Rome was begun in 753 BC.
古罗马于公元前七百五十三年建立。
17.
On the threshold leading to the new century for the celebration of the founding of the P.R.China;
站在新世纪的门槛前——庆建国五十周年
18.
Of course, in the first five years there will be the question of replacing the old cadres by the young, and there will be a five- to ten-year period of transition.
当然，前五年有个交替问题，有五年到十年的过渡时间。