| ประโยคภาษาจีน : 中文句子 | 
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|  lùn zhèng论证  le了  zài在  gěi dìng给定  duān chǐ端齿  chǐ齿  chā shù差数  hé和  gāng qiú钢球  zhí jìng直径  xiāng tóng相同  de的  tiáo jiàn条件  xià下  zhèng fù正负  chǐ齿  chà差  niè hé啮合  chǐ齿  kuò廓  de的  wéi yī xìng唯一性 | 
| It is proved that the profile of Positive and Negative transmission is unique if the face gear, the difference between face tooth number and ball number and the diameter of ball are the same. |