They create an optical illusion that the mint hopes is almost impossible to duplicate .
他们有一种错觉，造币厂觉得这几乎是不可能复制的。
Mint condition vintage clothing especially unworn stock , is very rare .
崭新的经典服装，尤其是从没穿过的，太难找。
The us treasury said it would not mint a platinum coin to avoid an increase in the nation 's borrowing limit , ending speculation that the obama administration would exploit an arcane loophole to avert a possible default .
