reduction to the meridian

... reduction to sea level 海平面订正 reduction to the meridian 近中天高度订正 reduction type semiconductor 还原型半导体 ...

测量学专业... ... 化算至海平面 reduction to sea level 化算至子午线 reduction to the meridian 化学刻图 chemical engraving ...

... 6868,reduction to the euqator, 赤道订正 6869,reduction to the meridian, 子午（圈）订正 6870,re-emission, 再发射，再辐射 ...