in the18th century 是18世纪还是19世纪?

in the18th century 是18世纪还是19世纪? 英语翻译是in early 14 century ,还是in the early 14 century ：in the past century in the early nineteenth century. century century 的含义公元224年属于in the second century 还是third century? in the mid-twentieth century什么意思?它的范围是19XX还是20XX? 英语作文急急急 题目是Life in the 21st Century early in the 18th century是译成早在18世纪 还是18世纪初期 in the first century AD怎么翻译? in the 16th century什么意思 in the 20th century是什么意思 Europe in the 18th century是什么意思 Realistic novel in the 18th century in the latter years of 19 century There are ____ in a century. Later in the next century,英语翻译中文 在二十世纪90年代 是 in the 1990s.二十世纪翻成英语变成了19那么在二十一世纪 是 in the 21st century 还是 in the 20th century?