marker [ˈmɑ:rkə(r)]

例句:

• Hence only cells bearing that marker can be infected.
  来自SA
• Draw your child's outline with a heavy black marker.
  用浓黑色的毡笔画出你孩子的轮廓。
  
• Youngs really put down a marker for the Lions.
  来自BBC
• He put a marker in his book and followed her out.
  他在书里夹了一个书签后便随她出去了。
  
• He placed a marker where the ball had landed.
  他在球落地的地方放了个标记。
  
• Companies are just trying to lay down a marker.
  来自VOA