grating groove

例句：

1. 1.The car's grille is designed to improve airflow.
   汽车的格栅设计是为了改善空气流通。
2. 2. The engineer used a grating to hold the metal together.
   工程师使用格栅来将金属固定在一起。
3. 3. The old house had several gratings on its walls.
   这所老房子的墙上有几个格栅。