half of all the rainwater that falls, comes from clouds produced by the trees themselves. 有半数的降水被树木 再次转变成云和降水并循环使用
yet they're home to over half of the world's species. 却汇集了世界上一半以上的物种.
But even so, squatters will move in given half a chance. 可是尽管如此 鼠兔的洞穴还是经常被其它动物霸占
0ne and a half billion swarm across the savannahs of Africa. 以15亿的数量聚集在非洲的稀树大草原上
By the end of the summer, the bear has lost half his weight. 但在夏天结束时,公熊的体重已经减少了一半
But half a ton of mad hairy cow is not to be trifled with. 不过在半数是脾气暴躁的母牛面前不好硬来
advancing two and a half miles a day. 一天扩大2.5英里
But with half the world's limestone still to be explored, 但世界上仍有一半石灰岩洞尚未被开发
These botos are huge - two and a half metres long. 这些亚马逊江豚体型巨大 身长达2.5米