undercrowding

例句：

1. 1. The subway was so crowdedthat it felt like a sardine can.
   地铁非常拥挤，感觉像沙丁鱼罐头。
2. 2. The concert hall was undercrowded, with only afew people in attendance.
   音乐会厅人很少，只有几个人参加。
3. 3. The overcrowding of the city has led to increasedcrime rates.
   城市的过度拥挤导致了犯罪率的上升。