环状撕裂
annular gear───[机]内齿轮；环形齿轮
annular gears───[机]内齿轮；环形齿轮
annual ring───[林]年轮
annular ligament───环状韧带
a fair hearing───公正的听证
annual rings───[林]年轮
annual savings───每年节省
annular eclipse───日环食；环蚀
annular space───环隙；[矿业]环形空隙
