activities for preschool children的用法和样例：
- This kind of toy is mean for preschool children.
- This kind of toy is meant for preschool children .
- Excretory-secretory antigens from the culture of Toxocara canis larvae were used as ELISA (TES-Ag-ELISA ) to detect the serum antibodies against toxocara larvae for preschool children in Chengdu area.
- Music Education for Preschool Children
- English Education for Preschool Children