a twopenny stamp的用法和样例：
- Bangladesh has an army, but it is a twopenny halfpenny affair kept deliberately weak, with the security forces split into three separate groups.
- I do not care a twopenny damn what become of the ashes of napoleon.
- I don't care a twopenny damn what becomes of the ashes of Napoleon.
- I bent over to pick up a twopenny piece and my back seized up-couldn't straighten it properly and I was in agony.