instinctively       
adverb uk/ɪnˈstɪŋk.tɪv.li/ us/ɪnˈstɪŋk.tɪv.li/
 本能地
in a way that is not thought about, planned, or developed by training
  She knew instinctively that he was dangerous. 她本能地知道他很危险。 
 Instinctively my hand reached for my phone. 我的手本能地去拿我的手机。 
 See: instinctive
 - More examples
- He instinctively saw that I needed help.
- Kids instinctively look to their parents to judge whether all is right with the world.
- If the bike starts to tip, we instinctively put our feet down.