the 18th century意思是18世纪还是19世纪

the secongd half of the 18th century啥意思? the 18th century意思是18世纪还是19世纪 in the 16th century什么意思 in the second half of 18th century怎么翻译?这里的second是咋意思呢? Europe in the 18th century是什么意思 Realistic novel in the 18th century in 18th century 要不要加the变成in the 18th century London's Chinese community dates back to the 18th century的意思 early in the 18th century是译成早在18世纪 还是18世纪初期 the 18th century 是中文的18世纪,还是19世纪? end of the 16th century这句话的意思是：16世纪末期 还是 16世纪结束 by the mid-18th century 用什么时态 初中英语in the 18th and 19th centuryin the 18th and 19th century（century要变为复数centuries吗?为什么?） 18世纪表示的是从几几年到几几年呀?用英语有几种表示法,写法?前面用不用加the呀,还是随便怎么样都行?in the 18th century---在18世纪,18后的th可以不加上去吗?18 century,若能意思也是一样的,指18 1900s和19th century区别in the late 1900s和in the late 19th century有什么区别?哪个是18世纪?`哪个是19世纪``?越详细越好``答的好给积分``` in the 20th century是什么意思 around the 19th century是什么意思? 英语1892年是18th还是19th century 怎么读呢