lower molar ratio formaldehyde-urea-melamine resin  低物质量比甲醛-尿素-三聚氰胺树脂

first molar  第一磨牙缺失; 第一磨牙; 第一大臼齿; 六龄牙; 第一臼齿

left supramaxillary first molar  左上颌第一磨牙

Mandibular first molar  下颚第一大臼齿; 下颌第一磨牙

mandibular permanent first molar  下颌第一恒磨牙

Maxillary first molar  第一磨牙; 上颌第一磨牙; 上颌第一恒磨牙

maxillary first molar extraction case  上颚第一大臼齿拔除病例

Permanent first molar  第一恒磨牙

The First molar  第一磨牙

three-rooted mandibular first molar  三牙根下颚第一大臼齿

The second mesiobuccal canal of maxillary first molar  上颌第一磨牙近中颊根第二根管

Permanent three-rooted mandibular first molar  3根型下颌第一恒磨牙

lower temperature and lower turbidity  低温低浊

the lower part of Lower Ganchaigou Formation  下干柴沟组下段

protein formula with lower natrium and lower phosphorum  低钠低磷型蛋白质制剂

alternate width-first and depth-first  宽度和深度交替优先

FCFS First Come First Served  先来先服务

FEFO First – End First – Out  先结束先退出; 先完先出

FEFO First C End First C Out  先结束先退出; 先完先出