孩子们在一列小型机械火车上玩得很开心 Children having fun aboard a small mechanical train

在阳光明媚的游乐园里，两个小女孩和两个小男孩坐在一列移动的小机械火车上玩得很开心。

Two little girls and two little boys having fun sitting aboard a moving little mechanical train at a sunny amusement park.