blackboards

例句:

• New blackboards have been fitted up in all the classrooms.
  教室里都安装上了新黑板.
  
• How many blackboards are there in this room?
  在这个房间里有几块黑板?
  
• Some cleaned the blackboards, others mopped the floor.
  有些人擦黑板, 有些人拖地板.
  
• The flares came faster and faster, blackboards burned brighter and brighter.
  来自NEWYORKER
• It is lined with whiteboards and markers the modern equivalent of blackboards and chalk.
  来自SA
• Blackboards and discussion replaced the simple will to win, and theory began to dictate practice.
  来自NEWYORKER