postage [ˈpəʊstɪdʒ]

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n.邮费，邮资

the money that you pay for sending letters and parcels through the post

This dictionary is 100 yuan, postage included. 这本词典连邮费共100元。
All letters must be stamped with the correct postage. 任何信件都应该按所需邮资贴邮票。