Should it be free of charge for the customer?

你认为退回的服务对消费者而言应当是免费的吗？

They believe a public park should be free of charge.

他们认为城市公园不应该收费。

Separate collection shall be free of charge for consumers.

分类回收对消费者是免费的。

People will not use money. All of things will be free of charge.

人们将会不用钱。所有的东西将会免费的。

Something may appear to be free of charge, but there may be a hidden cost.

有些东西看上去不用掏钱，但总有些隐含费用。