1.
He looked backward(s) forty years.
他回顾到四十年前。
2.
Rock music probably began in Europe about 30 or 40 years ago.
摇滚乐大约起源于三四十年前的欧洲，
3.
About forty years ago, at the turn of the century, China's national capitalism took its first steps forward.
到了同世纪末年和二十世纪初年，到了四十年前，中国民族资本主义便开始了初步的发展。
4.
We want our country to be among the advanced countries in the world through our forty years of hard work.
经过四十年努力走到世界前列。
5.
The solar system was formed 4.5 billion years ago.
太阳系是四十五亿年前形成的。
6.
Then in 1221, a temple was built in his memory by the side of his tomb which was the predecessor of the present temple.
到1221年(嘉定十四年)，在墓旁建庙，为今岳庙的前身。
7.
One is inscribed with a multiplication rhyme 2,200 years ago, reading "four times eight is 32, five times eight is 40".
一枚上书“四八三十二、五八四十”，这是2200年前的乘法口诀表；
8.
This factory entered into transistor production more than forty years ago.
这家工厂在四十多年以前就开始生产晶体管。
9.
Sichuan recently approves 200 foreign investment projects in the last ten months of this year
今年前十个月四川新批外资项目二百个
10.
Twenty-four years ago I returned, proud and joyful, to my country.
二十四年前，我骄傲而快乐地回到我的故乡。
11.
1950-1966, the Seventeen Years Eliminating Illiteracy Education in Sichuan Countryside before the Cultural Revolution;
“文革”前十七年（1950～1966）四川农村的扫盲教育
12.
World s Translations of Chinese Writings during Ten Years before “the May 4~(th)” New Culture Movement(1907-1919);
五四运动前十年的中国文学作品对外译介
13.
fourteen years for having attempted to escape on four occasions.
四次企图越狱，十四年。
14.
In April next year, I will head for the Heilongjiang River, where I will wait on the icebound banks for the seventeenth of April.
明年四月，我就前往黑龙江。 我要在那冰封的河岸上等着四月十七日。
15.
The United States has a history of only one hundred and eighty years, and sixty years ago it too produced four million tons of steel, so we are sixty years behind.
美国建国只有一百八十年，它的钢在六十年前也只有四百万吨，我们比它落后六十年。
16.
The progress achieved during the twenty years since the May 4th Movement exceeds not only that of the preceding eighty years but virtually surpasses that achieved in the thousands of years of Chinese history.
全部中国史中，五四运动以后二十年的进步，不但赛过了以前的八十年，简直赛过了以前的几千年。
17.
Last year, three-capital enterprise exports reached 1.44 billion US dollars, increasing by 15.7% over the same period of the previous year.
去年，三资企业出口比前年同期增长了百分之十五点七，达十四点四亿美元。
18.
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。