Libreville was named in imitation of Freetown and grew only slowly as a trading post and a minor administrative centre to a population of 31,000 on independence in 1960 .
It grew slowly as a trading post and a minor administrative centre .
It grew slowly as a trading post and a minor administrative centre .
简化这一段: Libreville was named in imitation of Freetown and grew only slowly as a trading post and a minor administrative centre to a population of 31,000 on independence in 1960 . 输出: