| 单词 | perimeter |
| 释义 | perimeter n. 1. a the circumference or outline of a closed figure. b the length of this. 2. a the outer boundary of an enclosed area. b a defended boundary. 3. an instrument for measuring a field of vision. Derivatives perimetric adj. Etymology: F p{eacute}rim{egrave}tre or f. L perimetrus f. Gk perimetros (as PERI-, metros f. metron measure) |
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