青云翻译

Late 20th century the world's population is twice the 1960s

At the end of 20th century of the world's population is twice times in the 1960 of the 20th century

20 century's end world populations are 20th century 60's two times

The end of the 20th century the world population is two times in the 1960s

At the end of 20th century of the world's population is twice times in the 1960 of the 20th century