‘But why?’ he persisted. “但是为什么呢？”他继续问道。

+with They are determined to persist with their campaign. 他们下定决心继续竞选。

+in She persisted in her refusal to pay. 她坚持拒绝付款。

persist in doing sth Why do you persist in denying that it was your fault? 为什么你就是死不承认那是你的错呢？

Call your doctor if the symptoms persist for more than three days. 如果症状持续超过3天，就打电话给你的医生。