英语听力：自然百科 大堡礁：自然奇迹—19（在线收听）

 There are many endurings mysteries about the great barrier reef,particularly at night,but this is one of the more enchanting ones.Watch this.This coral is fluorescing under ultraviolet light,it's this amazing light show,and it covers pretty much the whole of the reef crest.Look at this,vivid,vivid colors,it doesn't look real,it looks like some bizarre,sort of gxxx xxx is what it looks like.One theory is that this magical colors are in some way caused by the coral's sunscreen,but dispite lots of very clever people looking into it,no one really knows why this happens.And the same goes for much of the night time activities here.