small gap

例句：

1. 1. The small gap between the books allows air to circulate.
   书之间的小缝隙允许空气流通。
2. 2.The crack in the wall was filled with water after a heavy rain.
   墙缝在大雨后被水填满了。
3. 3. The crevice in the rock is where the river flows through.
   岩石中的缝隙是河流流过的地方。