busy和crowded有什么区别

busy和是繁忙的意思，而crowded则是拥挤的意思，区别可以从以下例子看出：

During covid 19 pandemic, people gathering for protest, very crowded in the city, make police very busy. 在covid 19大流行期间，人们聚集抗议，城市里非常拥挤，使警察非常忙碌。