释义
n. 周长,周界
例句
1. The plane stalled, flipped over onto its back and crashed near the perimeter. 飞机失速了，翻了一个跟头，坠毁在机场环形围栏附近。 2. The barbed wire fence round the perimeter discouraged intruders. 周围有铁丝网阻止了外人闯入.