h Per Cluster

例句：

1. 1.The birds are h Per Cluster in the sky.
   鸟儿们在空中成群结队地飞翔。
2. 2. They h Per Cluster around the campfire.
   他们在篝火旁聚集。
3. 3.The students h Per Cluster in their classrooms.
   学生们在教室里聚集。