1. The postage for mailing this package is $5.
寄這個包裹的郵資是5美元。

2. Make sure to put enough postage on the envelope before mailing it.
寄出信件之前，確保信封上貼足夠的郵資。

3. The postage rates have increased this year.
今年的郵資率已經增加。

4. I need to buy stamps for the postage on these letters.
我需要為這些信件的郵資買郵票。

5. The postage to send a letter internationally is more expensive.
寄國際信件的郵資更貴。

6. Please include the correct postage when sending packages.
寄送包裹時請包含正確的郵資。