Falling fertility is affecting family size, with the average number of children per family declining from 2.2 in 1986 to 1.4 last year.是什么意思_Falling fertility is affecting family size, with the average number of children per family declining from 2.2 in 1986 to 1.4 last year.在線(xiàn)翻譯_英語(yǔ)_讀音_用法_例句