occasional parasite

例句：

1. 1.She enjoys going to the park on weekends.
   她喜欢在周末去公园。
2. 2. The restaurant is usually crowded during lunchtime.
   这家餐厅通常在午餐时间很拥挤。
3. 3. He occasionally writes letters to his friends.
   他偶尔给朋友写信。