易混淆的单词： Sagitta

The sagittal depth , " s " , ( also called sagitta , sagittal height or sag ) is the perpendicular distance between the geometric center of the back lens surface and the diameter of the lens .

矢深，“s”,(又称矢高、弧高或垂距)，指镜片内曲面的几何学中心至线状直径之间的垂直距离。

Among them , meriones meridianus was the first dominant species , rhombomys opimus the second dominant species , dipus sagitta the common species , and rare species were allactaga elater , m. tamariscinus and mus musculus .

其中子午沙鼠为主优势种，大沙鼠为次优势种，三趾跳鼠为常见种，小五趾跳鼠（allactagaelater）、柽柳沙鼠（m.tamariscinus）、小家鼠（musmusculus）为罕见种；