high-level       
adjective uk/ˌhaɪˈlev.əl/ us/ˌhaɪˈlev.əl/
 (会谈)高层的
If discussions are high-level, very important people are involved in them.
  high-level meetings/talks between the two sides 双方的高层会晤/会谈 
 Compare: high-ranking
 
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