fingertip       
noun [ C ] uk/ˈfɪŋ.ɡə.tɪp/ us/ˈfɪŋ.ɡɚ.tɪp/
 指尖
the end of a finger
  Use your fingertips to gently flatten the pastry. 用指尖轻轻地把面团弄平。 
 Idioms      
at your fingertipsidiom C2 近在手边;很容易得到;随时可供使用
If you have information at your fingertips, you can get it and use it very easily.
  He has all the latest statistics at his fingertips. 他手边有所有最新的数据。 
 be an artist, professional, etc. to your fingertipsidiom UK 十足的艺术家/专业人士(等等)
to be a perfect or typical example of something
  Mark, a professional to his fingertips, insisted that we follow the correct procedures. 马克是个地地道道的专业人士,他坚持让我们遵照正确的程序。