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- Guards patrolled the perimeter of the airfield. 卫兵沿机场四周巡逻。
- hemispherical perimeter 半球状视野计
- The perimeter of the airfield is protected by guard-dogs. 机场外的环形防卫圈由警犬保卫着。
- The barbed wire fence round the perimeter discouraged intruders. 周围有铁丝网阻止了外人闯入。
- Guards had been posted at several points around the perimeter. 在环形防线上已布置了几处岗哨。
- A fence marked the perimeter of the field. 一道篱笆标明了那块田地的周界。
- 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。
- How am I to find the perimeter in the dark? 我在黑暗里怎么看出周围的警戒线呢?
- The end of the hole is hemispherical. 小孔端面成半球状。
- Work out how long the perimeter of the playground. 请你算一算体育场的周长是多少米?
- Guards patrol the perimeter of the estate. 保安人员在庄园四周巡逻。
- We might nab him if we set up a perimeter. 只要我们设个防线或许能逮捕到他。
- Ninjaroid: We have secured the perimeter, sir. 机械忍者:头领,我们在附近巡视过了。
- Military jeeps patrol the perimeter at night. 军方吉普车夜晚在周边巡逻。
- The river marks the eastern perimeter of our land. 这条河标示我们的土地东面的边界。
- Teacher: What is the perimeter of a circle? 师：什么是圆的周长?
- Calyx tube shallow, patelliform to hemispherical. 萼筒浅，对半球形小盘状。
- I want to be perimeter shooter.And I like shotting. 近期心愿： 射手、射手、我要做射手。
- Pull the squeegee down and wipe the perimeter. 将清洁刷从上往下拉，清洗其余区域以及窗户的圆周。
- What is the perimeter of this oblong. （这个矩形的周长是多少?）
