I forgot to stick a stamp on the letter.
我忘了在信上粘贴邮票。
Stick a stamp on the letter and then post it.
把信贴上邮票，然后寄出去。
Stick a stamp on the envelope before you post the letter.
寄信前要在信封上贴上邮票。
Don't forget to stick a stamp on the envelope...
不要忘记在信封上贴邮票。
Don't forget to stick a stamp on the envelope.
不要忘记在信封上贴邮票。
Don't forget to stick a stamp on the envelope.
不要忘记在信封上贴邮票。
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