1. I have get a twin - lens reflex camera. ����һ��˫��ͷ����ʽ�������
2. The lens of the eye accommodate to distance. ����״���ܸ��ݾ�����е��ڡ�
3. The distortion in an image using fish eye lens is an extreme example. һ��ʹ�����۾�����ͼ��ʧ����һ�����˵����ӡ�
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n.
1. a transparent optical device used to converge or diverge transmitted light and to form images
2. genus of small erect or climbing herbs with pinnate leaves and small inconspicuous white flowers and
3. (metaphor) a channel through which something can be seen or understood
4. biconvex transparent body situated behind the iris in the eye; it focuses light waves on the retina
5. electronic equipment that uses a magnetic or electric field in order to focus a beam of electrons
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