a type of plant which grows especially in wet places and which has blue , yellow or white flowers and long narrow leaves
发音
例句
1. The opening of the iris is called the pupil. 虹膜的开口处叫做瞳孔。 2. This incredible human eye, complete with retina and iris, can be found in the Maldives. 又是在马尔代夫,有这样一只难以置信的眼睛,连视网膜和虹膜都刻画齐全了。