When I was very young, just three or four, 我小时候,大概三四岁吧
He's brought his chicks, all four of them, 四只雏鸟在父亲的呵护下
where life on Earth first began four billion years ago. 生命正是起源于类似这样的喷口
Four billion human beings now live in the urban environment. 四十亿人口现在居住在城市环境中
only about four of them in 40 square miles. 百平方公里内只有四只
uncovered human skin will burn in four minutes. 裸露的人类肌肤四分钟内就会被晒伤
Yet, for four million years, the Komodo dragon has dominated here. 然而 四百万年来 科莫多巨蜥一直称霸这里