“I am not crazy,” says Dr. William Farber, shortly after performing acupuncture (针灸) on a rabbit. “I am ahead of my time.” If he seems a little defensive, it might be because even some of his coworkers occasionally laugh at his unusual methods. But Farber is certain he’ll have the last laugh. He’s one of a small but growing number of American veterinarians (兽医) now practicing “holistic” medicine – combining traditional Western treatments with acupuncture, chiropractic (按摩疗法) and herbal medicine.

这是 2024 年高考英语新全国卷1阅读B的一小段。

请问 ahead of one's time是什么意思？