同义词
1)long period delayed neutron,长半衰期缓发中子2)long-period delayed neutron,长半衰期缓发中子3)major semi axis,长半轴4)semi-major axis,长半轴5)semi major axis,长半径6)major semi-axis,长半轴7)semimajor axis of ellipsoid,椭球长半轴，地球长半轴8)Semi-major axis modification,长半轴修正9)long D slide valve,长半园滑阀10)long-radius grating,长半径光栅
