1.
in the eighties of the twentieth century
在20世纪80年代
2.
Between the middle nineteen-thirties and the nineteen-eighties,
从20世纪30年代中期至20世纪80年代，
3.
It was 20th century alchemy.
这是20世纪的炼金术。
4.
Well, it was launched in the 1980's.
哦，是20世纪的80年代。
5.
the scientific inventions of the 20th century
20世纪的科技发明.
6.
the whole spectrum of 20th - century thought.
20世纪所有不同的思潮
7.
Many people immigrated at the beginning of the 20th century.
20世纪初很多人移民。
8.
But in the late 1970s,
但在20世纪70年代后期，
9.
A Reflection Upon Translation Theory in 20~(th)Century;
В.Н.Комиссаров论20世纪的翻译理论
10.
The Gathering of Scattered Writings in The 20th Century(1950-1998);
20世纪辑佚学研究(1950—1998)
11.
Collection：19th-century perfumes, 20-century perfumes, 20th-century Cuban perfumes and toiletry.
收藏19、20世纪香水、20世纪古巴香水和化妆品。
12.
An Analysis on the American Diplomatic Thought from the Late 19th Century to the 1920s;
19世纪末至20世纪20年代美国外交思想探析
13.
Century s Waking up;
世纪的觉醒——上世纪之交中国人对20世纪的认知
14.
American City Beautiful Movement in the End of 19~(th) Century and the Beginning of the 20~(th) Century;
19世纪末20世纪初美国城市美化运动
15.
"New Reform": The PCE s Quests in the 1980s-21th Centruy;
“新改革”：西共20世纪末、21世纪初的探索
16.
The Improvement of Chinese Tea Industry between the End of 19～(th) Century and the Beginning of 20～(th) Century;
19世纪末20世纪初中国茶业改良
17.
On the Exploration in the Western Regions at the End of 19th Century and in the Early 20th Century;
论19世纪末20世纪初期的西域探险
18.
The Study on Russian Agricultural Loans during the End of the 19～(th) Century and the Beginning of 20～(th) Century;
浅析19世纪末-20世纪初俄国农业贷款