... 划分 1.(分成部分) divide; partition; repartition 划分势力范围 carve out spheres of influence; 划分行政区域 divide a country into administrative areas2.(区别) differentiate 划分敌友 differentiate between the enemy and the friend 齿割面tooth section 干割面 dead face ...
The mathematical pattern for accurately calculating volume of tooth and areas of each section which is dispersed along the length of tooth is established.
建立了精确计算直齿锥齿轮轮体积以及沿齿长方向各截面面积的数学模型；
2
Floss each tooth thoroughly with a clean section of floss.
牙线每一颗牙齿的牙线彻底清洁部分。
3
Objective:To investigate the appearance of enamel on the cross section of tooth after etched with 37% phosphoric acid for different etching time .