求翻译：甲方提前30日向乙方发出单方终止合同的书面通知后可提前终止本合同，但乙方不退还已支付的费用是什么意思？

Party A to Party B 30 days in advance to issue a written notice of the unilateral termination of the contract, early termination of this contract, but B is non-refundable fees paid

Advance Party to Party B 30 a bill to terminate the contract by written notice, may terminate the contract early, but Party B shall not refund fees paid by

正在翻译，请等待...

Issued 30th in advance of party a to party b after unilateral termination of the contract by notice in writing terminate the contract, party b do not refund fees paid by

The party of the first part ahead of time on 30th issues the folk remedy termination contract after the second party the written notification to be possible to terminate this contract ahead of time, but the second party does not return already the expense which pays