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1·Could you grant me a premium rebate?

你能给我保险费折扣吗？

2·We will at regular interval receive from them quite a handsome premium rebate.

我们定期会从保险公司那里收到数目相当可观的保险费回扣。

3·Usually we receive a handsome premium rebate from our underwriter at regular interval.

通常，我们可定期从保险商那里拿到一笔可观的保险费回扣。