In his own terminology
三句不离本行

On the job as a dental receptionist, I answered the phone from an auto-repair shop. The man on the line begged to see the dentist because of a painful tooth. “Which side of your mouth hurts?” I asked the patient. He sighed and answered, “The driver side.”

我是牙医诊所的前台接待员，接到一个男子从修车铺打来的电话，因牙痛求见牙医。我问他是哪一侧的牙齿痛。他叹了一口气说：“是司机那一侧的。”