Definitions of non-refundable
if something, especially a sum of money, is non-refundable then it cannot be repaid or returned
You have agreed to pay a minimum non-refundable retainer fee of $10,000.00 per month.
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不可退还的 means:
形容词
full
adjective
if something, especially a sum of money, is non-refundable then it cannot be repaid or returned
You have agreed to pay a minimum non-refundable retainer fee of $10,000.00 per month.