divided into three grades meaning in English

分为上中下三等

According to the clinical characters and profound degree , cp is divided into three grades , which are mild , moderate and profound grade
根据脑瘫的临床表现和严重程度，可以将其划分为轻度、中度和重度三个等级。
On the same ovariole , the development of egg chambers could be divided into three grades , namely , the 1st grade was yolkless , the 2nd was imcomplete with yolk protein , and the 3rd was full with yolk protein
同一根卵巢管中的卵子可分为三级，即1级卵(无卵黄) 、 2级卵(含有部分卵黄)和3级卵(充满卵黄) 。