Noun:

1. plants with sword-shaped leaves and erect stalks bearing bright-colored flowers composed of three petals and three drooping sepals

2. muscular diaphragm that controls the size of the pupil which in turn controls the amount of light that enters the eye; it forms the colored portion of the eye

3. diaphragm consisting of thin overlapping plates that can be adjusted to change the diameter of a central opening

iris diaphragmn.[摄]虹彩光圈；可变光圈

sword lilyn.[植]剑兰；鸢尾

flagn.旗；旗帜；信号旗vt.(以旗子)标出v.无力地下垂；减退；枯萎

fleur-de-lisn.鸢尾；鸢尾花形的纹章

1. The opening of the iris is called the pupil.
   虹膜的开口处叫做瞳孔。
2. The iris is fixed to the ciliary body.
   虹膜固定在睫状体上。
3. The iris of the eye is photographed from up to one meter away.
   眼睛的虹膜最远可在一公尺外的距离接受摄影。
4. Could you teach me how to adjust the iris of the camera?
   你能教我怎么调照相机的光圈吗？
5. Iris is the French national flower.
   鸢尾是法国国花。