a swarm of

例句：

1. 1. A swarm of bees is buzzing around the flower.
   一群蜜蜂在花周围嗡嗡作响。
2. 2.There was a swarm of people gathered in the square.
   人群聚集在广场上。
3. 3. The crowd swarmed around the stage like a swarm of bees.
   人群像蜂群一样围绕着舞台。