noun🔗Share周长，周边。 The sum of the distance of all the lengths of the sides of an object."The perimeter of the rectangular garden is 20 meters. "这个长方形花园的周长是20米。mathareaChat with AIVocabulary GamePractice Reading
noun🔗Share周长，周边。 The length of such a boundary."The perimeter of the garden is 20 meters. "花园的周长是20米。mathareaChat with AIVocabulary GamePractice Reading
noun🔗Share周界，周边，外围。 The outer limits of an area."The security guard walked the perimeter of the building every hour. "保安每小时都会沿着大楼的周界巡逻。areamathChat with AIVocabulary GamePractice Reading
noun🔗Share警戒线, 周边防线 A fortified strip or boundary usually protecting a military position."The soldiers patrolled the perimeter of the base, ensuring no one could get close undetected. "士兵们在基地的警戒线上来回巡逻，确保没有人能偷偷靠近。militarywarpositionChat with AIVocabulary GamePractice Reading
noun🔗Share视野计 An instrument for determining the extent and shape of the field of vision."The optometrist used the perimeter to check the extent of Sarah's field of vision. "验光师用视野计检查了萨拉的视野范围。medicinephysiologydeviceChat with AIVocabulary GamePractice Reading
