marksman       
noun [ C ] uk/ˈmɑːks.mən/ us/ˈmɑːrks.mən/  -men uk/ˈmɑːks.mən/ us/ˈmɑːrks.mən/
 神射手,神枪手
someone who can shoot a gun very accurately
  Police marksmen were called to the scene. 警方的神枪手被调至现场。 
 Synonym: sharpshooter
Compare: markswoman