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[[求助与讨论]] a dollar vs one dollar ?

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发表于 2007-5-5 06:09:37 | 显示全部楼层 |阅读模式
A dollar is any dollar.
Give me a dollar.

One dollar is a cardinal number, represented by the symbol 1.
This will cost you one dollar.

One is also used for emphasis:
The one dollar in my collection is mint proof.
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