To observe a vegetarian diet and strictly adhere to religious precepts; to live an ascetic and vegetarian life, often referring to Buddhist practices.
这位老人多年来一直持斋把素，生活清淡而有规律，身体依然硬朗。
For many years, this old person has observed a vegetarian diet and adhered to religious precepts, living a simple and disciplined life, and remains in good health.
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