One form of collectionletter is a letter of delinquency.
索款信的一种形式是拖欠债务催告信。
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EXAMPLE: Sometimes a persuasive collectionletter can be more effective than a punitive one.
有时，一封劝说性的催缴信要比处罚信更有效果。
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The seller obtains his bank's pre-numbered direct collectionletter, thus enabling him to send his documents directly to his bank's correspondent bank for collection.