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1·The client's would have to pay his Retainer Fee but it's worth it.

客户端不得不支付他聘金，但不值得的。

2·I have an attorney that is charging a retainer fee and also a contingency rate.

我的律师说，收取预聘费，也是应变率。

3·She is on call to work three times a week for a former client, in return for which she earns a decent retainer fee, school tuition for her grandson, and the flexibility to take on other clients.

她现在每周为一位老客户工作三次，随叫随到，得到的报酬是一笔不低的聘用费、孙子的学费和接手其他客户的灵活性。