receipt signal

例句：

1. 1. The receipt signal was a clear indication that the transaction had been completed successfully.
   收据信号是一个明确的指示，表明交易已经成功地完成了。
2. 2. The receipt signal helped us to confirm the accuracy of our records.
   收据信号帮助我们确认了记录的准确性。
3. 3. The receipt signal was used to prevent fraud and ensure the integrity of the transaction.
   收据信号被用来防止欺诈并确保交易的完整性。