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mùlù
qiē diǎn qiē diǎn
   xiàn zhuǎn biàn wéi zhí fǎn xiàn de diǎn huò gǎi biàn shuài de diǎn
No. 2
  liǎng tiáo guāng huá xiàn jiāo diǎnshǐ men zài gāi diǎn chù de qiē xiàn fāng xiàng xiāng tóng chēng gāi diǎn wéi qiē diǎn
  qiēdiǎn
   pointoftangency xiàn zhuǎn biàn wéi zhí fǎn xiàn de diǎn huò gǎi biàn shuài de diǎn
yīngwénjièshì
  1. :  tangent point
  2. n.:  point of tangency,  point of contact