他们通过叠放双手来表达团队精神。

They express team spirit by ___stacking their hands.

孩子们正在把积木一块一块地叠起来。

The children are ___stacking the blocks one by one.

她一直在仓库里堆叠纸箱。

She has been ___stacking cardboard boxes in the warehouse.

超市员工正在将热销商品堆放在视线高度以促进销售。

The supermarket staff is ___stacking popular products at eye level to boost sales.