grille       
noun [ C ] uk/ɡrɪl/ us/ɡrɪl/
 (窗户、机器等前面的)铁栅栏,护栏,金属网罩
a frame of metal bars used to cover something such as a window or a machine
  a security grille 安全护栏 
 A grille separated the prisoners from their visitors. 一道铁栅栏将犯人和探监者隔开。 
 
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