said of a person's sight: of normal acuity; perfect
[so called because of the practice of testing the vision of each eye separately to assess its capacity to distinguish characters on a chart 20ft (about 6m) away]
| 单词 | twenty-twenty |
| 释义 | twenty-twenty or 20/20adjsaid of a person's sight: of normal acuity; perfect [so called because of the practice of testing the vision of each eye separately to assess its capacity to distinguish characters on a chart 20ft (about 6m) away] |
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