We see that before 1650 it took nearly 35, 000 years, or about 1, 400 generations, for the world population to double.是什么意思_We see that before 1650 it took nearly 35, 000 years, or about 1, 400 generations, for the world population to double.在線(xiàn)翻譯_英語(yǔ)_讀音_用法_例句