If a place is crowded, a lot of people live there.
a crowded city of 2 million.
一个有200万人口的拥挤的城市。
If your schedule, your life, or your mind is crowded, it is full of events, activities, or thoughts.
Never before has a summit had such a crowded agenda.
从来没有一个高峰会议把议程安排得这样满。