她正在把胡萝卜擦碎。
She is ___grating carrots.
工人们在地铁站入口安装了新的金属栅栏。
Workers installed new metal ___gratings at the subway station entrance.
他指甲刮黑板的声音非常刺耳。
The sound of his nails on the chalkboard was ___grating.
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