A joke

Not long after an old Chinese woman came back to China from her visit to her daughter in the States, she went to a city bank to deposit the US dollars her daughter gave her. At the bank counter, the clerk checked each note carefully to see if the money was real. It made the old lady out of patience.
At last she could not hold any more, uttering. "Trust me, Sir, and trust the money. They are real US dollars. They are directly from America."

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I don't get it, at all, lol.