英语释义
1. the small circular area at the back of the retina where the optic nerve enters the eyeball and which is devoid of rods and cones and is not sensitive to light — called also optic disk — see eye illustration
2. a portion of a field that cannot be seen or inspected with available equipment
3. an area in which one fails to exercise judgment or discrimination
4. an area around a car, truck, etc., that the driver cannot see
5. a tendency to ignore something especially because it is difficult or unpleasant
6. a small area at the back of the eye that is not sensitive to light
7. the small circular area in the retina where the optic nerve enters the eye that is devoid of rods and cones and is insensitive to light — called also optic disk