1) early 20~(th) century
20时期前期
2) the early 20th century
20世纪前期
1.
In the early 20th century,the system of occupational income of comprador got maturity and perfect.
20世纪前期,买办的职业报酬制度达到成熟和完善。
3) the first half of the 20th century
20世纪前半期
1.
Investigations and researches of ethnic peoples in southwest China had been one of the academic focuses of the country in the first half of the 20th century.
西南民族调查与研究是20世纪前半期中国学术的一大热点,杨成志从1928年的滇川调查开始,致力于西南民族研究,两度出洋留学考察,博采欧美学术,并以中山大学为依托,训练出一批研究西南民族的杰出人才,中山大学因而成为西南民族研究的重镇,杨成志也成为西南民族调查与研究的先驱。
2.
In the first half of the 20th century,a batch of non-government organizations which advocated public health played a great role in the public health promotion campaign and epidemic disease treatment.
20世纪前半期上海一批倡导公共卫生的民间组织在公共卫生宣传和时疫救治中发挥了相当作用。
4) 18~th-early 20century
18-20世纪前期
5) Prehistory
[英][,pri:'hɪstri] [美][pri'hɪstrɪ]
史前时期
1.
The Appearance, Development and Pervasion of Prehistory Rice Cultivation Agriculture in the Haidai Region;
海岱地区史前时期稻作农业的产生、发展和扩散
2.
Tentative Research on Jade Wares from Xiuyan in Prehistory;
史前时期岫玉器初步研究
补充资料：前期
1.所定日期之前;事情出现之前。 2.事前或过去的约定;预定。 3.对未来的预期﹐打算。 4.某一时期的前一阶段。
说明：补充资料仅用于学习参考，请勿用于其它任何用途。
参考词条