Sagh萨格sagv.下垂；下跌；消沉n.下垂；下跌；凹陷；[航海]随风漂流Sagittaria guyanensisn.冠果草Sagnac interferometer萨尼亚克干涉仪sagittal acceleration纵向加速度sag-to-span ratio垂跨比sag and tension curve弛度张力曲线Sagittal bent crystal弧矢弯曲晶体sag modified quantity垂度修正量Sagitella kowalevskiin.箭蚕Sagittaria platyphylla阔叶慈姑Sagittarius star cloud人马座星云