英语汉译英填空
1.无论他是怎么完成的,这都是一个巨大的成功.
no matter how he did it,it was a _________ _______.
2.几年前,因为某种无人知晓的原因,这种稀有的鸟绝迹了.
several years ago a rare species of bird________ ________for some unknown reasons.
3.据说这个岛盛产铁矿石.
it is said that this island is _____ ________iron ore.