countable dense subsystem

例句：

1. 1.The countable items are the ones that can be counted and identified.
   可数物品是可以计数和识别的物品。
2. 2. We need to countable the number of people who will be attending the event.
   我们需要计算将出席该活动的人数。
3. 3. The countable resources are limited and must be used wisely.
   可数资源有限，必须明智使用。