They suggest limiting the length of tooth-brushing to two minutes and a force of 150 grams.
研究人员建议，刷牙的时间应该是两分钟，力度应在150克左右。
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；
Then I'll reshape the tooth to reduce the length of it a little bit.
然后我要给这颗牙齿弄一弄，使它的长度变得短一些。
应用推荐