1.
She was said to have been an actress about twenty years ago .
据说她在20年以前曾是一位女演员。
2.
The Gathering Together of Scattered Writings in the 20th Century;
20世纪的辑佚学研究(1949年以前)
3.
Promotion and Exprience of Course-elective Systemof Universities around the 1920 s;
20世纪20年代前后大学选科制的推行及经验——以国立东南大学为例
4.
Review on the Studies of the Early Qing Provincial Governors since 1960s;
20世纪60年代以来清前期督抚研究综述
5.
On the Factors Leading to the Success of French Immigration Policy before 1970s;
20世纪70年代以前法国移民政策的成功因素
6.
The Characteristics of Environmental History Studies before 1990 in the USA;
20世纪90年代以前美国环境史研究的特点
7.
Investigations on the Dulong Ethnic Group since 1950s in Retrospect and in Prospect;
20世纪50年代以来独龙族调查研究回顾与前瞻
8.
Study on the Preschool Curriculum Reform of China since 1980’s;
20世纪80年代以来我国学前课程改革研究
9.
Prior to 1949, the mortality rate was as high as 20 per thousand, while by the end of the 1970s it had dropped to below 7 per thousand.
1949年以前，中国的人口死亡率高达20‰，七十年代末下降到7‰以下。
10.
By the end of 2005, all coal-burning boilers smaller than 14 MW in the urban area will be converted to cleaner energy, including that of 14 MW or larger if available.
2005年年底前，市区现有20吨以下燃煤锅炉全部改用清洁能源；
11.
On Kinsfolk Addressing Terms of Na People--Comparative Study before and After 1990s
纳人亲属称谓的几个问题——20世纪 90年代以前和以后研究的对比
12.
I am engaged in it for three years, that is, till I was twenty years old
我从事这项工作有3年了,也就是说，在20岁以前就开始了
13.
Chicago's most famous figure before the 1980s was the gangster,Al "Scar-face"Capone.
20世纪80年代以前，芝加哥最著名的人物是歹徒"疤面"艾尔·卡彭。
14.
He had cut 20 strokes off his average without having swung a golf club in seven years!
他比自己以前打的平均杆数还低20杆，而他已7年未上场！
15.
Phinney has produced a chart of the numerous gibberellins known prior to March 20, 1969.
菲尼把1969年3月20日以前发现的许多赤霉素做了一张图表。
16.
The motivation of Soviet jewry living before 20 century 70s is firstly reviewed.
首先考察了20世纪70年代初期及以前的苏联犹太人移民动机。
17.
In l979, average family income in the top 5 percent of the earnings distribution was more than l0 times that in the bottom 20 percent.
1979年，收入排在前5％的家庭的平均所得是末尾20%的家庭的10倍以上。
18.
We should appreciate it if you would let us know the proposed title of your paper before December 20, 1973.
您如能在1973年12月20日以前告之您拟定的题目，我们将非常感谢。