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A contract between attorney and client stating the nature of the services to be rendered and the cost of the services.
律师与当事人签订的协议，确认法律服务的性质、费用等。
The retainer is the advance payment（提前支付）to an attorney for services to be performed， intended to insure that the lawyer will represent the client and that the lawyer will be paid at least that amount. Most lawyers wish to be paid either in advance or promptly as the work is performed.
律师通常会要求当事人提前支付一部分律师费，或者在委托事项完成之后支付。