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1·We undercharge Mr. Smith and have to send him a debit note for the extra amount.

我们少收了史密斯先生的钱，只得给他寄去一张借条所要欠款。

2·L To ensure that all room rate charged is accurate, avoid any undercharge or overcharge that will cause disputes.

确保所有房间价格准确，避免任何会有争议的价格的上下浮动。