| 正面 | 6680.perimeter 英 [pə'rɪmɪtə]美 [pə'rɪmɪtɚ]     |
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| 背面 |      释义： 1. peri- "周围、附近" => perimeter, perigee.n. 周长；周界；[眼科] 视野计 例句： 1. By night, the perimeter wire was illumined by lights.到了夜里，周遭的铁丝网都被灯光照亮。 perimeter 外缘，周长peri-,在周围，-meter,测量，词源同meter,diameter.引申词义外缘，周长。 perimeter (n.)early 15c., "line around a figure or surface," from Latin perimetros, from Greek perimetron "circumference," from peri- "around" (see peri-) + metron "measure" (see meter (n.2)). Military sense of "boundary of a defended position" is attested from 1943." |